workflow to build apk added

.github/workflows/check.yml

@@ -0,0 +1,27 @@
+name: Verify
+
+on:
+  pull_request:
+    types: [ opened, ready_for_review, synchronize ]
+    branches: [ master ]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.draft == false
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+
+      - name: Build apk
+        run: ./gradlew build --stacktrace