Add android build workflow

.forgejo/workflows/Android.yaml

@@ -0,0 +1,50 @@
+name: Android Build
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  publish:
+  
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 24
+
+      - name: Install deps
+        run: npm ci
+
+      - name: Sync capacitor
+        run: npx cap sync
+
+      - name: Generate assets
+        run: npx capacitor-assets generate --android
+        
+      - name: Update web app
+        run: npx cap copy
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+
+      - name: Build unsigned release APK
+        run: |
+          cd android
+          ./gradlew assembleRelease
+
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: miarven
+          path: ./android/app/build/outputs/apk/release/app-release-unsigned.apk