feat: add .github actions

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/PULL_REQUEST_TEMPLATE.md

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+## 👀 What is Changed?
+
+ *
+
+## 📣 API Changes
+
+ *
+
+## 📝 Notes
+
+ *
+
+## ☑️ Checklist
+ - [ ] The code compiles successfully
+ - [ ] I've run `cargo clippy` to lint and check code style
+ - [ ] I've written the test code and runs successfully
+ - [ ] I've updated API docs and noticed to the co-workers for updates

.github/workflows/release-artifacts.yml

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+name: Release Artifacts
+
+on:
+  push:
+    tags:
+      - "v[0-9]+.[0-9]+.[0-9]+" # Push events to matching v*, i.e. v1.0, v20.15.10
+      - "v[0-9]+.[0-9]+.[0-9]+-rc*" # Push events to matching v*, i.e. v1.0-rc1, v20.15.10-rc5
+
+jobs:
+  release-artifacts:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install latest stable
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+          components: rustfmt, clippy
+      - name: Setup Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Generate Cargo.lock
+        run: |
+          cargo build --workspace
+          cargo fetch --verbose
+      - name: Build Artifacts
+        run: |
+          docker run --rm -v "$(pwd)":/code \
+          --mount type=volume,source="$(basename "$(pwd)")_cache",target=/code/target \
+          --mount type=volume,source=registry_cache,target=/usr/local/cargo/registry \
+          cosmwasm/workspace-optimizer:0.15.1
+          tar -zcvf cosmwasm-artifacts.tar.gz artifacts
+      - name: Create Release
+        uses: softprops/action-gh-release@v1
+        with:
+          files: cosmwasm-artifacts.tar.gz
+          body_path: CHANGELOG.md

.github/workflows/tests.yml

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+name: Formatting Check & Test
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+      - develop
+      - "release/*"
+
+jobs:
+  clippy:
+    name: Actions - clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          components: clippy
+          profile: minimal
+          override: true
+      - run: cargo fetch --verbose
+      - run: cargo clippy --all --all-targets -- -D warnings
+
+  rustfmt:
+    name: Actions - rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          components: rustfmt
+          profile: minimal
+          override: true
+      - run: cargo +nightly fmt -- --check
+
+  unit-test:
+    name: Actions - unit test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-latest ]
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+      - run: cargo fetch --verbose
+      - run: cargo build
+      - run: cargo test --verbose --all
+        env:
+          RUST_BACKTRACE: 1