Add GitHub Actions job for JavaDoc verification

Author: pivovarit

.github/workflows/build.yml

@@ -31,3 +31,19 @@ jobs:
       - name: Build with Maven
         run: mvn package
 
+  verify-javadoc:
+    runs-on: ubuntu-latest
+    name: Validate JavaDocs
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup JDK
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '23'
+          architecture: 'x64'
+          cache: 'maven'
+
+      - name: Validate JavaDocs
+        run: mvn package -DskipTests=true javadoc:javadoc
+