Add CI with GitHub Actions (#4078)

* Create android.yml

* Bump ABT and Gradle versions

* Update android.yml

.github/workflows/android.yml

@@ -0,0 +1,17 @@
+name: Android CI
+
+on:
+  push
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+
+    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 -Pcoverage lintBetaDebug pmd checkstyle jacocoTestBetaDebugUnitTestReport