Add Github actions CI

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+# This workflow will build a Java project with Gradle
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
+
+name: Android CI with Gradle
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  unit_tests:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Print Java version
+        run: java -version
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: Clean project
+        run: ./gradlew clean --stacktrace
+      - name: Build project skipping tests
+        uses: reactivecircus/android-emulator-runner@v2
+        with:
+          api-level: 22
+          script: ./gradlew build -x test --stacktrace
+      - name: Run jacocoTestReport for each module
+        run: ./gradlew jacocoTestReport --stacktrace
+      - name: Merge jacoco reports from all modules
+        run: ./gradlew jacocoFullReport --stacktrace
+      - name: Upload coverage to Coveralls with Gradle
+        run: ./gradlew coveralls --stacktrace