Add GitHub actions build.

.github/workflows/build.yaml

@@ -0,0 +1,27 @@
+name: CI Build
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    name: Build project
+    runs-on: ubuntu-latest
+
+    steps:
+
+    - name: Check out sources
+      uses: actions/checkout@v4
+
+    - name: Set up JDK 17
+      uses: actions/setup-java@v4
+      with:
+        distribution: 'temurin'
+        java-version: 17
+        cache: 'maven'
+
+    - name: Build with Maven
+      env:
+        DEVELOCITY_ACCESS_KEY: ${{ secrets.GRADLE_ENTERPRISE_SECRET_ACCESS_KEY }}
+      run: ./mvnw clean verify -B