ci: skip central-publishing plugin during build

- Add -Dcentral.publishing.skip=true to all Maven builds
- Central publishing plugin is only needed for Maven Central releases
- Prevents plugin resolution errors during CI builds
- Complements existing -Dgpg.skip=true flag

.github/workflows/spark-integration-tests.yml

@@ -61,19 +61,19 @@ jobs:
       run: |
         echo "Building Java client (required by HDFS clients)..."
         cd other/java/client
-        mvn clean install -DskipTests -Dgpg.skip=true
+        mvn clean install -DskipTests -Dgpg.skip=true -Dcentral.publishing.skip=true
         echo "✓ Java client built and installed to local Maven repo"
         cd ../../..
         
         echo "Building HDFS2 client (depends on Java client)..."
         cd other/java/hdfs2
-        mvn clean install -DskipTests -Dgpg.skip=true
+        mvn clean install -DskipTests -Dgpg.skip=true -Dcentral.publishing.skip=true
         echo "✓ HDFS2 client built"
         cd ../../..
         
         echo "Building HDFS3 client (depends on Java client)..."
         cd other/java/hdfs3
-        mvn clean install -DskipTests -Dgpg.skip=true
+        mvn clean install -DskipTests -Dgpg.skip=true -Dcentral.publishing.skip=true
         echo "✓ HDFS3 client built"
 
     - name: Prepare artifacts for upload