fix: tdengine swarm cluster(3 mnodes) startup error (#20966)

* fix: tdengine swarm cluster(3 mnodes) startup error

add check if dnode has been created when TDengine docker image starts

Resolves #19837

* refactor: change the check (#6f53e8ed76) location

packaging/docker/bin/entrypoint.sh

@@ -42,8 +42,9 @@ if [ "$DISABLE_ADAPTER" = "0" ]; then
     done
 fi
 
-# if has mnode ep set or the host is first ep or not for cluster, just start.
-if [ -f "$DATA_DIR/dnode/mnodeEpSet.json" ] ||
+# if dnode has been created or has mnode ep set or the host is first ep or not for cluster, just start.
+if [ -f "$DATA_DIR/dnode/dnode.json" ] ||
+    [ -f "$DATA_DIR/dnode/mnodeEpSet.json" ] ||
     [ "$TAOS_FQDN" = "$FIRST_EP_HOST" ]; then
     $@
 # others will first wait the first ep ready.