Add GHA build workflow

.github/workflows/maven.yml

@@ -0,0 +1,36 @@
+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ "graylog" ]
+  pull_request:
+    branches: [ "graylog" ]
+
+# Cancel running build when a new ref gets pushed.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up JDK 17
+      uses: actions/setup-java@v3
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+        cache: maven
+
+    - name: Build with Maven
+      env:
+        MAVEN_OPTS: >
+          -DtrimStackTrace=false
+          -Djansi.force=true
+        MAVEN_ARGS: >
+          --show-version --batch-mode --fail-fast --update-snapshots --no-transfer-progress
+      run: mvn verify -Pits --file pom.xml