ci: add CI workflows for Android, Linux, and Windows builds

Author: ahmet-cetinkaya

.github/workflows/flutter-ci.android.yml

@@ -0,0 +1,64 @@
+name: Flutter CI - Android
+
+on:
+  workflow_dispatch: # This is a trigger for manual workflow run
+  push:
+    tags:
+      - 'v*.*.*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v4
+
+    # Install dependencies
+    - name: Set up Flutter
+      uses: subosito/flutter-action@v2
+      with:
+        channel: 'stable'
+
+    - name: Set up JDK 17
+      uses: actions/setup-java@v3
+      with:
+        java-version: '17'
+        distribution: 'adopt'
+
+    - name: Setup Android SDK
+      uses: android-actions/setup-android@v3
+    
+    # Build for Android
+    - name: Install Flutter dependencies
+      run: flutter pub get
+
+    - name: Modify app_usage build.gradle
+      run: |
+        PUB_CACHE="${HOME}/.pub-cache"
+        APP_USAGE_PATH="${PUB_CACHE}/hosted/pub.dev/app_usage-3.0.1/android/build.gradle"
+        if [ -f "$APP_USAGE_PATH" ]; then
+          sed -i 's/^    compileSdkVersion .*$/    compileSdkVersion 33/' "$APP_USAGE_PATH"
+          sed -i '/^android {/a \ \ namespace "dk.cachet.app_usage"' "$APP_USAGE_PATH"
+          sed -i '/^android {/a \ \ compileOptions { sourceCompatibility = JavaVersion.VERSION_17; targetCompatibility = JavaVersion.VERSION_17; }' "$APP_USAGE_PATH"
+          sed -i '/^android {/a \ \ kotlinOptions { jvmTarget = "17" }' "$APP_USAGE_PATH"
+        else
+          echo "build.gradle not found. Please check the package path."
+          exit 1
+        fi
+
+    - name: Build for Android
+      run: flutter build apk --release
+    
+    # Publish the build artifacts
+    - name: Get application version
+      id: app_version
+      run: |
+        APP_VERSION=$(awk '/^version:/ {print $2}' pubspec.yaml)
+        echo "APP_VERSION=${APP_VERSION}" >> $GITHUB_ENV
+
+    - name: Upload Android build artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: whph-v${{ env.APP_VERSION }}-android
+        path: build/app/outputs/flutter-apk/app-release.apk

.github/workflows/flutter-ci.linux.yml

@@ -0,0 +1,52 @@
+name: Flutter CI - Linux
+
+on:
+  workflow_dispatch: # This is a trigger for manual workflow run
+  push:
+    tags:
+      - 'v*.*.*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v4
+
+    # Install dependencies
+    - name: Set up Flutter
+      uses: subosito/flutter-action@v2
+      with:
+        channel: 'stable'
+
+    - name: Install Flutter dependencies
+      run: flutter pub get
+
+    - name: Install dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y cmake ninja-build build-essential clang pkg-config libgtk-3-dev
+      env:
+        CXX: clang++
+
+    # Build for Linux
+    - name: Build for Linux
+      run: flutter build linux --release
+    
+    # Publish the build artifacts
+    - name: Get application version
+      id: app_version
+      run: |
+        APP_VERSION=$(awk '/^version:/ {print $2}' pubspec.yaml)
+        echo "APP_VERSION=${APP_VERSION}" >> $GITHUB_ENV
+
+    - name: Upload Linux build artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: whph-v${{ env.APP_VERSION }}-linux
+        path: build/linux/x64/release/bundle/
+        if-no-files-found: warn
+        compression-level: 6
+        overwrite: false
+        include-hidden-files: false

.github/workflows/flutter-ci.windows.yml

@@ -0,0 +1,42 @@
+name: Flutter CI - Windows
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+jobs:
+  build:
+    runs-on: windows-latest
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      # Install dependencies
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: "stable"
+
+      - name: Install Flutter dependencies
+        run: flutter pub get
+
+      # Build for Windows
+      - name: Build for Windows
+        run: flutter build windows --release
+
+      # Publish the build artifacts
+      - name: Get application version
+        id: app_version
+        run: |
+          $content = Get-Content 'pubspec.yaml'
+          $version = $content | Select-String 'version: (.*)' | ForEach-Object { $_.Matches.Groups[1].Value }
+          echo "App version is $version"
+          echo "APP_VERSION=$version" >> $GITHUB_ENV
+
+      - name: Upload Windows build artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: whph-v${{ env.APP_VERSION }}-windows
+          path: build/windows/runner/Release/