Debian-specific cluster startup message from initdb

Forwarded: No, Debian specific

Gbp-Pq: Name initdb-startup-message

src/bin/initdb/initdb.c

@@ -3363,7 +3363,7 @@ main(int argc, char *argv[])
 
 	printf(_("\nSuccess. You can now start the database server using:\n\n"
 			 "    %s\n\n"),
-		   start_db_cmd->data);
+		   getenv("CLUSTER_START_COMMAND") ? getenv("CLUSTER_START_COMMAND") : start_db_cmd->data);
 
 	destroyPQExpBuffer(start_db_cmd);