chore: Add github action.

Author: dsherret

.github/workflows/ci.yml

@@ -0,0 +1,84 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: ${{ matrix.config.kind }} ${{ matrix.config.os }}
+    runs-on: ${{ matrix.config.os }}
+    strategy:
+      matrix:
+        config:
+          - os: ubuntu-16.04
+            kind: test_release
+          - os: ubuntu-16.04
+            kind: test_debug
+
+    env:
+      CARGO_INCREMENTAL: 0
+      RUST_BACKTRACE: full
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install wasm32 target
+      if: matrix.config.kind == 'test_release'
+      run: rustup target add wasm32-unknown-unknown
+
+    - name: Install and use nightly compiler
+      run: rustup default nightly
+
+    - name: Run setup script
+      run: |
+        chmod +x setup.sh
+        ./setup.sh
+
+    - name: Cache cargo registry
+      uses: actions/cache@v1
+      with:
+        path: ~/.cargo/registry
+        key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+    - name: Cache cargo index
+      uses: actions/cache@v1
+      with:
+        path: ~/.cargo/git
+        key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+    - name: Cache cargo build
+      uses: actions/cache@v1
+      with:
+        path: target
+        key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Build debug
+      if: matrix.config.kind == 'test_debug'
+      run: cargo build --verbose
+    - name: Build release
+      if: matrix.config.kind == 'test_release'
+      run: cargo build --target wasm32-unknown-unknown --release --verbose
+
+    - name: Test debug
+      if: matrix.config.kind == 'test_debug'
+      run: cargo test --verbose
+    - name: Test release
+      if: matrix.config.kind == 'test_release'
+      run: cargo test --release --verbose
+
+    - name: Get tag version
+      if: matrix.config.kind == 'test_release' && startsWith(github.ref, 'refs/tags/')
+      id: get_tag_version
+      run: echo ::set-output name=TAG_VERSION::${GITHUB_REF/refs\/tags\//}
+
+    - name: Pre-release
+      if: matrix.config.kind == 'test_release' && startsWith(github.ref, 'refs/tags/')
+      run: |
+        cd target/wasm32-unknown-unknown/release/
+        mv dprint_plugin_rustfmt.wasm rustfmt-${{ steps.get_tag_version.outputs.TAG_VERSION }}.wasm
+
+    - name: Release
+      uses: softprops/action-gh-release@v1
+      if: matrix.config.kind == 'test_release' && startsWith(github.ref, 'refs/tags/')
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        files: |
+          target/wasm32-unknown-unknown/release/rustfmt-${{ steps.get_tag_version.outputs.TAG_VERSION }}.wasm
+        draft: true