Add Workflow for Maven Build

Each PR should be built with `mvn clean verify` to execute the integration tests. This helps PR validation.

Author: KarstenSchnitter

.github/workflows/maven-verify.yml

@@ -0,0 +1,17 @@
+name: Maven Verify
+
+on:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+      - name: Build with Maven
+        run: mvn clean verify