ci(github): migrate ci from circleci to github

.github/actions/check-build-artifacts/action.yml

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+# For more information see:
+# - https://docs.github.com/en/actions/creating-actions/creating-a-composite-action
+# - https://docs.github.com/en/actions/creating-actions/metadata-syntax-for-github-actions#outputsoutput_id
+
+# The action can be referenced in workflows like:
+# - ngxs/store/.github/actions/check-build-artifacts@master
+# - ./.github/actions/check-build-artifacts
+
+name: check-build-artifacts
+description: Ensure the build artifact directories exist
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Check @ngxs build artifacts
+      shell: bash
+      run: |
+        echo "Making sure the build artifact directories exist."
+        [[ -d $DEVTOOLS_PLUG_ART ]] && echo "$DEVTOOLS_PLUG_ART $OK" || echo "$DEVTOOLS_PLUG_ART $FAILURE" exit 1
+        [[ -d $FORM_PLUG_ART ]] && echo "$FORM_PLUG_ART $OK" || echo "$DEVTOOLS_PLUG_ART $FAILURE" exit 1
+        [[ -d $HMR_PLUG_ART ]] && echo "$HMR_PLUG_ART $OK" || echo "$HMR_PLUG_ART $FAILURE" exit 1
+        [[ -d $LOGGER_PLUG_ART ]] && echo "$LOGGER_PLUG_ART $OK" || echo "$LOGGER_PLUG_ART $FAILURE" exit 1
+        [[ -d $ROUTER_PLUG_ART ]] && echo "$ROUTER_PLUG_ART $OK" || echo "$ROUTER_PLUG_ART $FAILURE" exit 1
+        [[ -d $STORAGE_PLUG_ART ]] && echo "$STORAGE_PLUG_ART $OK" || echo "$STORAGE_PLUG_ART $FAILURE" exit 1
+        [[ -d $STORE_ART ]] && echo "$STORE_ART $OK" || echo "$STORE_ART $FAILURE" exit 1
+        [[ -d $WEBSOCKET_PLUG_ART ]] && echo "$WEBSOCKET_PLUG_ART $OK" || echo "$WEBSOCKET_PLUG_ART $FAILURE" exit 1
+      env:
+        OK: 'exists'
+        FAILURE: 'does not exist'
+        DEVTOOLS_PLUG_ART: './@ngxs/devtools-plugin'
+        FORM_PLUG_ART: './@ngxs/form-plugin'
+        HMR_PLUG_ART: './@ngxs/hmr-plugin'
+        LOGGER_PLUG_ART: './@ngxs/logger-plugin'
+        ROUTER_PLUG_ART: './@ngxs/router-plugin'
+        STORAGE_PLUG_ART: './@ngxs/storage-plugin'
+        STORE_ART: './@ngxs/store'
+        WEBSOCKET_PLUG_ART: './@ngxs/websocket-plugin'

.github/actions/download-integration-test-artifacts/action.yml

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+# For more information see:
+# - https://docs.github.com/en/actions/creating-actions/creating-a-composite-action
+# - https://docs.github.com/en/actions/creating-actions/metadata-syntax-for-github-actions#outputsoutput_id
+
+# The action can be referenced in workflows like:
+# - ngxs/store/.github/actions/download-integration-test-artifacts@master
+# - ./.github/actions/download-integration-test-artifacts
+
+name: download-integration-test-artifact
+description: Downloads all integration test artifacts with names such as 'hello-world-ng11-ivy'.
+
+inputs:
+  path:
+    description: A path to download the artifacts.
+    required: true
+    default: './integrations'
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Download hello-world-ng11-ivy artifacts
+      uses: actions/download-artifact@v3
+      with:
+        name: hello-world-ng11-ivy
+        path: ${{ inputs.path }}
+
+    - name: Download hello-world-ng12-ivy artifacts
+      uses: actions/download-artifact@v3
+      with:
+        name: hello-world-ng12-ivy
+        path: ${{ inputs.path }}
+
+    - name: Download hello-world-ng13-ivy artifacts
+      uses: actions/download-artifact@v3
+      with:
+        name: hello-world-ng13-ivy
+        path: ${{ inputs.path }}
+
+    - name: Download hello-world-ng14-ivy artifacts
+      uses: actions/download-artifact@v3
+      with:
+        name: hello-world-ng14-ivy
+        path: ${{ inputs.path }}

.github/actions/setup/action.yml

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+# For more information see:
+# - https://docs.github.com/en/actions/creating-actions/creating-a-composite-action
+# - https://docs.github.com/en/actions/creating-actions/metadata-syntax-for-github-actions#outputsoutput_id
+
+# The action can be referenced in workflows like:
+# - ngxs/store/.github/actions/setup@master
+# - ./.github/actions/setup
+
+name: setup
+description: Set up environment
+
+inputs:
+  node-version:
+    description: Node version
+    required: true
+    default: 16.x
+  github-ref-name:
+    description: Branch name
+    required: true
+    default: ${{ github.ref_name }}
+  github-sha:
+    description: Commit hash
+    required: true
+    default: ${{ github.sha }}
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Don't save Bash session history
+      shell: bash
+      run: unset HISTFILE
+
+    - name: Use Node.js ${{ inputs.node-version }}
+      uses: actions/setup-node@v3
+      with:
+        node-version: ${{ inputs.node-version }}
+        check-latest: true
+
+    - name: Configure kernel (increase watchers)
+      shell: bash
+      run: echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
+
+    - name: Workspace cache
+      uses: actions/cache@v3
+      id: workspace-cache
+      env:
+        cache-name: workspace-cache
+      with:
+        path: |
+          ~/.cache
+          ./node_modules
+          ./@ngxs
+          ./integrations/hello-world-ng11-ivy/dist-integration
+          ./integrations/hello-world-ng12-ivy/dist-integration
+          ./integrations/hello-world-ng13-ivy/dist-integration
+          ./integrations/hello-world-ng14-ivy/dist-integration
+        key: ${{ runner.os }}-node-${{ inputs.node-version }}-yarn-${{ hashFiles('**/yarn.lock') }}-branch-${{ inputs.github-ref-name }}-sha-${{ inputs.github-sha }}
+        restore-keys: |
+          ${{ runner.os }}-node-${{ inputs.node-version }}-yarn-${{ hashFiles('**/yarn.lock') }}-branch-${{ inputs.github-ref-name }}-sha-
+          ${{ runner.os }}-node-${{ inputs.node-version }}-yarn-${{ hashFiles('**/yarn.lock') }}-branch-
+          ${{ runner.os }}-node-${{ inputs.node-version }}-yarn-
+          ${{ runner.os }}-
+
+    - name: Install project dependencies
+      shell: bash
+      run: yarn install --frozen-lockfile --non-interactive

.github/actions/upload-integration-test-artifact/action.yml

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+# For more information see:
+# - https://docs.github.com/en/actions/creating-actions/creating-a-composite-action
+# - https://docs.github.com/en/actions/creating-actions/metadata-syntax-for-github-actions#outputsoutput_id
+
+# The action can be referenced in workflows like:
+# - ngxs/store/.github/actions/upload-integration-test-artifact@master
+# - ./.github/actions/upload-integration-test-artifact
+
+name: upload-integration-test-artifact
+description: Upload an integration test artifact with a name such as 'hello-world-ng11-ivy'.
+
+inputs:
+  script:
+    description: A script with a name such as 'integration:ng11:ivy' that generates an integration test artifact.
+    required: true
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Generate an artifact name
+      id: artifact-name
+      shell: bash
+      run: |
+        echo "Replace colons with dashes, substring 'integration' with a substring 'hello-world'. Example result: hello-world-ng11-ivy"
+        echo "::set-output name=value::$(echo ${SCRIPT} | sed -r "s/:/-/g" | sed -r "s/integration/hello-world/g")"
+      env:
+        SCRIPT: ${{ inputs.script }}
+
+    - name: Upload ${{ inputs.script }} artifact
+      uses: actions/upload-artifact@v3
+      with:
+        name: ${{ steps.artifact-name.outputs.value }}
+        path: ./integrations/**/dist-integration/main.*.js
+        retention-days: 1

.github/workflows/pr-validation.yml

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+# For more information see:
+# - https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
+# - https://docs.github.com/en/actions/learn-github-actions/contexts#github-context
+
+name: pr-validation
+
+on:
+  pull_request:
+
+defaults:
+  run:
+    shell: bash
+
+concurrency:
+  group: ${{ github.head_ref }}.${{ github.sha }}.pr-validation
+  cancel-in-progress: true
+
+jobs:
+  premerge-build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Setup
+        uses: ./.github/actions/setup
+        with:
+          node-version: 16.x
+          github-ref-name: ${{ github.ref_name }}
+          github-sha: ${{ github.event.pull_request.head.sha }}
+
+      - name: Build NGXS
+        run: yarn build
+
+  premerge-test:
+    runs-on: ubuntu-latest
+    needs: premerge-build
+
+    strategy:
+      matrix:
+        node-version: [16.x]
+        script: [lint, eslint, 'test:ci']
+
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Setup
+        uses: ./.github/actions/setup
+        with:
+          node-version: ${{ matrix.node-version }}
+          github-ref-name: ${{ github.ref_name }}
+          github-sha: ${{ github.event.pull_request.head.sha }}
+
+      - name: Run ${{ matrix.script }}
+        run: yarn ${{ matrix.script }}
+
+      - name: Upload coverage results to Code Climate
+        if: ${{ matrix.script == 'test:ci' }}
+        run: |
+          curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > /tmp/cc-test-reporter
+          chmod +x /tmp/cc-test-reporter
+          /tmp/cc-test-reporter after-build --coverage-input-type lcov --exit-code 0
+        env:
+          CC_TEST_REPORTER_ID: 3f4c9a9d57ded045e0f9ab5d23e5bbcbf709bb85637bea555f1233e72134b818 # TODO: better store it in the repository secrets. Name the variable: CC_TEST_REPORTER_ID. Then delete this line and uncomment the next one
+          # CC_TEST_REPORTER_ID: ${{ secrets.CC_TEST_REPORTER_ID }}
+
+  premerge-integration-test:
+    runs-on: ubuntu-latest
+    needs: premerge-build
+
+    strategy:
+      matrix:
+        node-version: [16.x]
+        script:
+          - 'integration:ng7'
+          - 'integration:ng8'
+          - 'integration:ng9:ivy:off'
+          - 'integration:ng9:ivy'
+          - 'integration:ng10:ivy:off'
+          - 'integration:ng10:ivy'
+          - 'integration:ng11:ivy:off'
+          - 'integration:ng11:ivy'
+          - 'integration:ng12:ivy'
+          - 'integration:ng13:ivy'
+          - 'integration:ng14:ivy'
+          - 'test:types'
+
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Setup
+        uses: ./.github/actions/setup
+        with:
+          node-version: ${{ matrix.node-version }}
+          github-ref-name: ${{ github.ref_name }}
+          github-sha: ${{ github.event.pull_request.head.sha }}
+
+      - name: Run ${{ matrix.script }}
+        run: yarn ${{ matrix.script }}
+
+      - name: Upload an integration test artifact
+        if: ${{ matrix.script == 'integration:ng11:ivy' || matrix.script == 'integration:ng12:ivy' || matrix.script == 'integration:ng13:ivy' || matrix.script == 'integration:ng14:ivy' }}
+        uses: ./.github/actions/upload-integration-test-artifact
+        with:
+          script: ${{ matrix.script }}
+
+  premerge-bundlesize:
+    runs-on: ubuntu-latest
+    needs: premerge-integration-test
+
+    strategy:
+      matrix:
+        node-version: [16.x]
+        script: [bundlesize]
+
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Setup
+        uses: ./.github/actions/setup
+        with:
+          node-version: ${{ matrix.node-version }}
+          github-ref-name: ${{ github.ref_name }}
+          github-sha: ${{ github.event.pull_request.head.sha }}
+
+      - name: Download integration test artifacts
+        uses: ./.github/actions/download-integration-test-artifacts
+
+      - name: Run ${{ matrix.script }}
+        run: yarn ${{ matrix.script }}