add gh action to create release when pushing tags

.github/workflows/release.yml

@@ -0,0 +1,44 @@
+on:
+  push:
+    # Sequence of patterns matched against refs/tags
+    tags:
+    - '*' # Push events to matching *, i.e. 1.0, 20.15.10
+
+name: Create Release and Upload Assets
+
+jobs:
+  build:
+    name: "Build APK"
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Build with Gradle
+      run: ./gradlew assembleProdRelease
+
+    - 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 .apk
+      id: upload-release-apk-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/prod/release/app-prod-release.apk 
+        asset_name: app-prod-release.apk
+        asset_content_type: application/vnd.android.package-archive
+