update github action ci

.github/workflows/ci.yml

@@ -1,6 +1,17 @@
 name: CI
 
-on: [ push, pull_request ]
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - 'v*'
+  pull_request:
+    paths-ignore:
+      - '**/*.md'
+      - '**/*.txt'
+      - '**/*.png'
+      - '**/*.jpg'
 
 jobs:
   publish:
@@ -34,3 +45,53 @@ jobs:
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle/wrapper/gradle-wrapper.properties', '**/buildSrc/src/main/kotlin/**.kt') }}
       - name: Build
         run: ./gradlew --parallel app:assembleRelease
+
+  apk:
+    name: Generate APK
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup JDK
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'adopt'
+          java-version: 11
+      - name: Build APK
+        run: ./gradlew --parallel app:assembleRelease
+      - name: Upload APK
+        uses: actions/upload-artifact@v2
+        with:
+          name: apk
+          path: app/build/outputs/apk/release/app-release.apk
+  release:
+    name: Release APK
+    needs: apk
+    if: startsWith(github.ref, 'refs/tags/v')
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download APK from build
+        uses: actions/download-artifact@v2
+        with:
+          name: apk
+      - name: Display structure of downloaded files
+        run: ls -R
+
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1.1.4
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ github.ref }}
+      - name: Upload Release APK
+        id: upload_release_asset
+        uses: actions/upload-release-asset@v1.0.1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: ./app-release.apk
+          asset_name: app-release.apk
+          asset_content_type: application/zip