Add a GitHub Actions workflow to run tests and lint.

.github/workflows/run-tests.yml

@@ -0,0 +1,28 @@
+name: Run Tests
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Set up JDK
+      uses: actions/setup-java@v3
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+
+    - name: Checkout Submodules
+      uses: actions/checkout@v3
+
+    - name: Validate Gradle Wrapper
+      uses: gradle/wrapper-validation-action@v1
+
+    - name: Run Lint
+      run: ./gradlew lint --console plain
+
+    - name: Run Unit Tests
+      run: ./gradlew test --console plain