added workflow

.github/workflows/release.yml

@@ -0,0 +1,68 @@
+name: Build and Release Signed APK
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v2
+        with:
+          java-version: '17'
+
+      - name: Decode and write keystore
+        run: echo ${{ secrets.KEYSTORE_FILE }} | base64 --decode > release.keystore
+
+      - name: Build Release APK
+        run: ./gradlew assembleRelease
+        env:
+          KEYSTORE_FILE: release.keystore
+          KEYSTORE_PASSWORD: ${{ secrets.KEYSTORE_PASSWORD }}
+          KEY_ALIAS: ${{ secrets.KEY_ALIAS }}
+          KEY_PASSWORD: ${{ secrets.KEY_PASSWORD }}
+
+      - name: Sign the APK
+        run: |
+          jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 \
+            -keystore $KEYSTORE_FILE \
+            -storepass $KEYSTORE_PASSWORD \
+            -keypass $KEY_PASSWORD \
+            app/build/outputs/apk/release/app-release-unsigned.apk $KEY_ALIAS
+
+      - name: Verify the APK
+        run: |
+          jarsigner -verify -verbose -certs app/build/outputs/apk/release/app-release-unsigned.apk
+
+      - name: Zipalign the APK
+        run: |
+          ${ANDROID_SDK_ROOT}/build-tools/30.0.3/zipalign -v 4 app/build/outputs/apk/release/app-release-unsigned.apk app/build/outputs/apk/release/app-release.apk
+
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ github.ref }}
+          draft: false
+          prerelease: false
+
+      - name: Upload Release Asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: app/build/outputs/apk/release/app-release.apk
+          asset_name: app-release.apk
+          asset_content_type: application/vnd.android.package-archive
+