"<call sign> missing, run the create_sysop.pl" error after OVERWRITE_CONFIG use

[kconkas]

When CLUSTER_CALLSIGN option doesn't match that previously used (stored the Docker volume) and OVERWRITE_CONFIG is set to yes, the following error appears on startup:

Do you wish to destroy your user database (THINK!!!) [y/N]: Do you wish to reset your cluster and sysop information? [y/N]: cluster
DXSpider V1.55, build 0.166 (git: 4868adf[i]) started
Copyright (c) 1998-2019 Dirk Koopman G1TLH
loading prefixes ...
US Database not loaded
loading band data ...
loading user file system ...
<CLUSTER_CALLSIGN> missing, run the create_sysop.pl script and please RTFM at ./cluster.pl line 449.
<CLUSTER_CALLSIGN> missing, run the create_sysop.pl script and please RTFM at ./cluster.pl line 449.
 at ./cluster.pl line 449.

The only workaround for this is to destroy the dxspider_data docker volume after removing any containers that may be using it (thus losing previously stored data):

$  docker volume rm dxspider_data
dxspider_data
Error response from daemon: remove dxspider_data: volume is in use - [bd576e537b7aa449b00b7642debd11437672644aac6bd6cc5a63a026166231b4]
$ docker rm bd576e537b7aa449b00b7642debd11437672644aac6bd6cc5a63a026166231b4
bd576e537b7aa449b00b7642debd11437672644aac6bd6cc5a63a026166231b4
$ docker volume rm dxspider_data
dxspider_data