ci: Add GitHub Actions workflow for Maven tests

Add CI workflow to run Maven tests on:
- Push to main branch
- Pull requests targeting main branch

The workflow includes:
- Java 17 setup with Temurin distribution
- Maven dependency caching
- Test execution with mvnw
- Test report generation
- Upload test results as artifacts

Author: claude

.github/workflows/maven-test.yml

@@ -0,0 +1,38 @@
+name: Maven Tests
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+          cache: 'maven'
+
+      - name: Run tests with Maven
+        run: ./mvnw test
+
+      - name: Generate test report
+        if: always()
+        run: ./mvnw surefire-report:report
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results
+          path: target/surefire-reports/