Add dependabot

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "maven"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/workflows/maven.yml

@@ -0,0 +1,29 @@
+name: Java CI
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Java ${{ matrix.java }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        java:
+          [
+            17,
+            21,
+          ]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up JDK ${{ matrix.java }}
+        uses: actions/setup-java@v4
+        with:
+          java-version: ${{ matrix.java }}
+          distribution: oracle
+          cache: maven
+      - name: Build with Maven
+        run: mvn -B clean package