chore: added GitHub Action workflow

.github/workflows/main.yml

@@ -0,0 +1,74 @@
+name: CI
+on:
+    push:
+        branches:
+            - main
+    pull_request:
+
+jobs:
+    main:
+        name: Build, lint, and test on Node ${{ matrix.node }} and ${{ matrix.os }}
+        runs-on: ${{ matrix.os }}
+        if: ${{ github.event_name != 'pull_request' }}
+        strategy:
+            matrix:
+                node: [ '14.x', '16.x', '17.x' ]
+                os: [ ubuntu-latest, windows-latest ]
+
+        steps:
+            -   name: Checkout repo
+                uses: actions/checkout@v2
+
+            -   name: Use Node ${{ matrix.node }}
+                uses: actions/setup-node@v2
+                with:
+                    node-version: ${{ matrix.node }}
+
+            -   name: Install deps and build (with cache)
+                uses: bahmutov/npm-install@v1
+                with:
+                    useLockFile: false
+
+            -   name: Lint
+                run: yarn lint
+
+            -   name: Test
+                run: yarn test --ci --coverage --maxWorkers=2
+
+            -   name: Build
+                run: yarn build
+
+    pr:
+        name: Build, lint, and test on Node ${{ matrix.node }} and ${{ matrix.os }}
+        runs-on: ${{ matrix.os }}
+        if: ${{ github.event_name == 'pull_request' }}
+        strategy:
+            matrix:
+                node: [ '14.x', '16.x', '17.x' ]
+                os: [ ubuntu-latest, windows-latest ]
+
+        steps:
+            -   name: Checkout repo
+                uses: actions/checkout@v2
+                with:
+                    ref: ${{ github.event.pull_request.head.ref }}
+                    fetch-depth: 0
+
+            -   name: Use Node ${{ matrix.node }}
+                uses: actions/setup-node@v2
+                with:
+                    node-version: ${{ matrix.node }}
+
+            -   name: Install deps and build (with cache)
+                uses: bahmutov/npm-install@v1
+                with:
+                    useLockFile: false
+
+            -   name: Lint
+                run: yarn lint
+
+            -   name: Test
+                run: yarn test --ci --coverage --maxWorkers=2
+
+            -   name: Build
+                run: yarn build