[hotfix][starrocks] Fix StarRocks FE startup failure due to insufficient disk space available

This closes #3508.

flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-starrocks/src/test/java/org/apache/flink/cdc/connectors/starrocks/sink/StarRocksMetadataApplierITCase.java

@@ -357,6 +357,9 @@ public class StarRocksMetadataApplierITCase extends StarRocksSinkTestBase {
                         .set(JDBC_URL, STARROCKS_CONTAINER.getJdbcUrl())
                         .set(USERNAME, StarRocksContainer.STARROCKS_USERNAME)
                         .set(PASSWORD, StarRocksContainer.STARROCKS_PASSWORD);
+        config.addAll(
+                Configuration.fromMap(
+                        Collections.singletonMap("table.create.properties.replication_num", "1")));
 
         DataSink starRocksSink = createStarRocksDataSink(config);
 

flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-starrocks/src/test/java/org/apache/flink/cdc/connectors/starrocks/sink/StarRocksPipelineITCase.java

@@ -43,6 +43,7 @@ import org.junit.BeforeClass;
 import org.junit.Test;
 
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 import static org.apache.flink.cdc.connectors.starrocks.sink.StarRocksDataSinkOptions.JDBC_URL;
@@ -163,6 +164,10 @@ public class StarRocksPipelineITCase extends StarRocksSinkTestBase {
                         .set(USERNAME, StarRocksContainer.STARROCKS_USERNAME)
                         .set(PASSWORD, StarRocksContainer.STARROCKS_PASSWORD);
 
+        config.addAll(
+                Configuration.fromMap(
+                        Collections.singletonMap("table.create.properties.replication_num", "1")));
+
         Sink<Event> starRocksSink =
                 ((FlinkSinkProvider) createStarRocksDataSink(config).getEventSinkProvider())
                         .getSink();

flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-starrocks/src/test/java/org/apache/flink/cdc/connectors/starrocks/sink/utils/StarRocksContainer.java

@@ -32,7 +32,11 @@ import java.util.List;
 /** Docker container for StarRocks. */
 public class StarRocksContainer extends JdbcDatabaseContainer<StarRocksContainer> {
 
-    private static final String DOCKER_IMAGE_NAME = "starrocks/allin1-ubuntu:3.2.6";
+    // NOTE: StarRocks 3.x introduces free space check (> 5GB) during FE node startup
+    // (https://github.com/StarRocks/starrocks/pull/34813), which will fail on a typical GitHub
+    // runner environment. Downgraded to 2.x series for now to avoid blocking CI, and upgrade this
+    // after StarRocks provide a workaround for this.
+    private static final String DOCKER_IMAGE_NAME = "starrocks/allin1-ubuntu:2.5.21";
 
     // exposed ports
     public static final int FE_HTTP_SERVICE_PORT = 8080;