Use GitHub Actions.

Author: rkistner

Diff for: .github/workflows/build.yml

@@ -0,0 +1,16 @@
+name: Build Android
+
+on: [pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v2
+        with:
+          distribution: 'temurin'
+          java-version: '11'
+      - name: Build and Lint with Gradle
+        run: ./gradlew build