Add GitHub Actions workflow.

.github/workflows/test.yml

@@ -0,0 +1,25 @@
+name: Run Tests
+
+on:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+  services:
+    fauna:
+      image: fauna/faunadb
+      ports:
+        - 8443:8443
+  steps:
+    - name: Check out repository
+      uses: actions/checkout@v4
+
+    - name: Set up JDK
+      uses: actions/setup-java@v4
+      with:
+        java-version: '17'
+        distribution: corretto
+
+    - name: Run sample app
+      run: ./gradlew build