ci: add workflow for push

.github/workflows/push_ci.yml

@@ -0,0 +1,56 @@
+name: main
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ master ]
+    paths-ignore:
+      - '**.md'
+      - '**.txt'
+      - '.github/**'
+      - '!.github/workflows/**'
+
+jobs:
+  build:
+    name: Build CI
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup cmake
+        uses: jwlawson/actions-setup-cmake@v1.12
+        with:
+          cmake-version: '3.22.1'
+      - name: Prepare Java 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+          java-package: jdk
+      - name: Cache Gradle Dependencies
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+            !~/.gradle/caches/build-cache-*
+          key: gradle-deps-core-${{ hashFiles('**/build.gradle') }}
+          restore-keys: |
+            gradle-deps
+      - name: Cache Gradle Build
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.gradle/caches/build-cache-*
+          key: gradle-builds-core-${{ github.sha }}
+          restore-keys: |
+            gradle-builds
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: Build with Gradle
+        run: |
+          ./gradlew :app:assembleRelease
+          echo "APK_FILE=$(find app/build/outputs/apk/release -name '*.apk')" >> $GITHUB_ENV
+      - name: Upload Artifacts
+        uses: actions/upload-artifact@v2
+        with:
+          path: ${{ env.APK_FILE }}
+          name: app-release-${{ github.event.head_commit.id }}