Use a GH action to build PRs

Author: marko-bekhta

.github/workflows/build.yml

@@ -0,0 +1,29 @@
+name: Build pull request
+
+on:
+  pull_request:
+    paths-ignore:
+      - '.gitignore'
+      - 'CODEOWNERS'
+      - 'LICENSE'
+      - '*.md'
+      - '*.adoc'
+      - '*.txt'
+      - '.all-contributorsrc'
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+
+      - name: Build
+        run: ./mvnw -B clean verify