fail to mount hadoop-config-volume when using flink-k8s-operator

[Liting Liu (litiliu)]

Hi, community:
  I'm using flink-k8s-operator v1.2.0 to deploy flink job. And the 
"HADOOP_CONF_DIR" environment variable was setted in the image that i buiilded 
from flink:1.15.  I found the taskmanager pod was trying to mount a volume 
named "hadoop-config-volume" from configMap.  But the configMap with the name 
"hadoop-config-volume" was't created.

Do i need to remove the "HADOOP_CONF_DIR" environment variable in dockerfile?
If yes, what should i do to specify the hadoop conf？