Adding GitHub action for CI

Adds a GitHub action that runs on push or open pull requests against the main branch. The verification uses JDK 11, 17, and 21.

.github/workflows/maven.yml

@@ -0,0 +1,34 @@
+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [11, 17, 21]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up JDK ${{ matrix.java }}
+        uses: actions/setup-java@v3
+        with:
+          java-version: ${{ matrix.java }}
+          distribution: temurin
+          cache: maven
+      - name: Build with Maven
+        run: mvn -B package --file pom.xml -Dgroups=functional
+
+      # Optional: Uploads the full dependency graph to GitHub to improve the quality of Dependabot alerts this repository can receive
+      - name: Update dependency graph
+        uses: advanced-security/maven-dependency-submission-action@571e99aab1055c2e71a1e2309b9691de18d6b7d6