Add build action

.github/workflows/build.yml

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+name: Java CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # test against latest update of each major Java version, as well as specific updates of LTS versions:
+        java: [ 8, 11, 17 ]
+    name: Java ${{ matrix.java }} build
+    steps:
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+      - name: Set up JDK ${{ matrix.java }}
+        uses: actions/setup-java@99b8673ff64fbf99d8d325f52d9a5bdedb8483e9 # v4.2.1
+        with:
+          distribution: 'temurin' # See 'Supported distributions' for available options
+          java-version: ${{ matrix.java }}
+      - name: Cache Maven packages
+        uses: actions/cache@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4.0.2
+        with:
+          path: ~/.m2
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-m2          
+      - name: Show Maven version
+        run: mvn --version
+      - name: Build with Maven
+        run: mvn --batch-mode --update-snapshots verify

renovate.json

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended"
+  ]
+}