feature: add github workflows

.github/workflows/build.yml

@@ -0,0 +1,73 @@
+name: CI
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build-linux:
+    name: Build for Linux
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.1.3'
+      - run: flutter config --enable-linux-desktop
+      - run: flutter pub get
+      - name: Build for Linux
+        run: flutter build linux
+      - name: Archive Linux Artifact
+        uses: actions/upload-artifact@master
+        with:
+          name: linux-build
+          path: build/x64/release/bundle
+
+  build-android:
+    name: Build for Android
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.1.3'
+      - uses: actions/setup-java@v2
+        with:
+          distribution: 'zulu'
+          java-version: '11'
+      - run: flutter config --enable-android
+      - run: flutter pub get
+      - run: flutter build apk
+      - run: flutter build appbundle
+      - name: Archive Android Artifact
+        uses: actions/upload-artifact@master
+        with:
+          name: android-build
+          path: |
+            build/app/outputs/flutter-apk/app-release.apk
+            build/app/outputs/bundle/release/app-release.aab
+
+  build-and-publish-web:
+    name: Build and Publish for Web
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.1.3'
+      - name: Enable flutter web
+        run: flutter config --enable-web
+      - name: Get dependencies
+        run: flutter pub get
+      - name: Build for Web
+        run: flutter build web
+      - name: Publish to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: build/web

.github/workflows/test.yml

@@ -0,0 +1,22 @@
+name: Test
+
+on:
+  workflow_dispatch:
+
+jobs:
+  tests:
+    name: Run Tests
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Set up Flutter
+      uses: subosito/flutter-action@v2
+      with:
+        flutter-version: '3.1.3'
+    - name: Get dependencies
+      run: flutter pub get
+    - name: Analyze
+      run: flutter analyze
+    - name: Run tests
+      run: flutter test