Setup CI for testing, gplay release and foss release.

.github/workflows/code-checks.yml

@@ -0,0 +1,34 @@
+name: Code tests & eval
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build-and-test:
+    name: Build and test
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 11
+        uses: actions/setup-java@v2
+        with:
+          java-version: '11'
+          distribution: 'adopt'
+          cache: gradle
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Build FOSS variant
+        run: ./gradlew assembleFossDebug
+      - name: Test FOSS variant
+        run: ./gradlew testFossDebugUnitTest
+
+      - name: Build Google Play variant
+        run: ./gradlew assembleGplayDebug
+      - name: Test Google Play variant
+        run: ./gradlew testGplayDebugUnitTest