ci: add build workflow

.github/workflows/build.yaml

@@ -0,0 +1,55 @@
+name: Build changelog_cli
+
+on:
+  push:
+    tags:
+      - "changelog_cli-v[0-9]+.[0-9]+.[0-9]+"
+
+jobs:
+  build_changelog_cli:
+    name: Build changelog_cli
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        include:
+          - binary-name: changelog_cli
+            os: ubuntu-latest
+          - binary-name: changelog_cli.exe
+            os: windows-latest
+          - binary-name: changelog_cli
+            os: macos-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dart-lang/setup-dart@v1
+      - run: cd changelog_cli
+      - run: dart pub get
+      - run: mkdir build
+      - run: mkdir build/${{ matrix.os }}
+      - run: dart compile exe bin/changelog_cli.dart -o build/${{ matrix.os }}/${{ matrix.binary-name }}
+      - uses: actions/upload-artifact@v2
+        with:
+          name: bin-${{ matrix.os }}
+          path: build/${{ matrix.os }}
+
+    release:
+      needs: build_changelog_cli
+      name: Create GitHub Release
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/download-artifact@v2
+          with:
+            name: bin-ubuntu-latest
+            path: bin-linux
+        - uses: actions/download-artifact@v2
+          with:
+            name: bin-macos-latest
+            path: bin-macos
+        - uses: actions/download-artifact@v2
+          with:
+            name: bin-windows-latest
+            path: bin-windows
+        - uses: softprops/action-gh-release@v1
+          with:
+            draft: true
+            files: bin-*/*