added workflow

.github/workflows/build-app.yml

@@ -0,0 +1,66 @@
+name: Android Release
+run-name: ${{ GITHUB.ACTOR }} is compiling an Android App 🚀
+
+on:  
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+    paths:
+      - "lib/**"
+
+jobs:
+
+  build_apk:
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Checkout repository
+      uses: actions/checkout@v3
+
+    - name: Setup Java
+      uses: actions/setup-java@v3
+      with:
+        distribution: "zulu"
+        java-version: "12.x"
+        cache: "gradle"
+
+    - name: Setup Flutter
+      uses: subosito/flutter-action@v2
+      with:
+        flutter-version: "3.0.0"
+        cannel: "stable"
+        cache: true
+
+    - name: Get depenencies
+      run: flutter pub get
+
+    - name: Start release build
+      run: flutter build apk --split-per-abi
+
+  release_apk:
+    needs: build_apk
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Checkput repository
+        uses: actions/checkout@v3
+
+      - name: Upload APK as Artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: Android APK
+          path: |
+            build/app/outputs/flutter-apk/*.apk
+            build/app/outputs/flutter-apk/*.sha1
+
+      - name: Upload APK as release
+        uses: "marvinpinto/action-automatic-releases@latest"
+        with:
+          repo_token: "${{ secrets.GITHUB_TOKEN }}"
+          automatic_release_tag: "latest"
+          prerelease: true
+          title: "Android APK"
+          files: |
+            build/app/outputs/flutter-apk/*.apk
+            build/app/outputs/flutter-apk/*.sha1