chore: add release flow

.github/workflows/build.yml

@@ -15,7 +15,7 @@ jobs:
       - run: flutter build apk --split-per-abi
       - uses: actions/upload-artifact@v4
         with:
-          name: "freeflow_release.aab"
+          name: "release.aab"
           path: "build/app/outputs/bundle/release/app-release.aab"
       - uses: actions/upload-artifact@v4
         with:

.github/workflows/release.yml

@@ -0,0 +1,46 @@
+name: Release
+on:
+  push:
+    tags:
+      - v[0-9]+.[0-9]+.[0-9]+
+      - v[0-9]+.[0-9]+.[0-9]+-*
+jobs:
+  android:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: stable
+      - run: flutter pub get
+      - name: Build apk
+        env:
+          KEYSTORE: ${{ secrets.KEYSTORE }}
+          KEYSTORE_PASSWORD: ${{ secrets.KEYSTORE_PASSWORD }}
+          KEY_ALIAS: ${{ secrets.KEY_ALIAS }}
+          KEY_PASSWORD: ${{ secrets.KEY_PASSWORD }}
+          KEYSTORE_SHA256: ${{ secrets.KEYSTORE_SHA256 }}
+        run: flutter build apk --split-per-abi --release
+      - uses: actions/upload-artifact@v4
+        with:
+          name: "app-arm64-v8a-release.apk"
+          path: "build/app/outputs/flutter-apk/app-arm64-v8a-release.apk"
+      - uses: actions/upload-artifact@v4
+        with:
+          name: "app-armeabi-v7a-release.apk"
+          path: "build/app/outputs/flutter-apk/app-armeabi-v7a-release.apk"
+      - uses: actions/upload-artifact@v4
+        with:
+          name: "app-x86_64-release.apk"
+          path: "build/app/outputs/flutter-apk/app-x86_64-release.apk"
+      - name: Upload assets
+        uses: softprops/action-gh-release@v1
+        with:
+          files: |
+            build/app/outputs/flutter-apk/app-arm64-v8a-release.apk
+            build/app/outputs/flutter-apk/app-armeabi-v7a-release.apk
+            build/app/outputs/flutter-apk/app-x86_64-release.apk