feat: add .yml file to run unit tests in GitHub Actions

Author: joragua

.github/workflows/android-unit-tests.yml

@@ -0,0 +1,31 @@
+name: Android Unit Tests
+
+on:
+  push:
+    branches:
+      - "*"
+  pull_request:
+    branches:
+      - "*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v2
+        with:
+          java-version: '11'
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Build with Gradle
+        run: ./gradlew build
+
+      - name: Run tests
+        run: ./gradlew test