fix: DKIM key generation broken when Rspamd & OpenDKIM are enabled (#3535)

Co-authored-by: Georg Lauterbach <44545919+georglauterbach@users.noreply.github.com>

target/bin/open-dkim

@@ -4,8 +4,12 @@
 source /usr/local/bin/helpers/index.sh
 
 if [[ -f /etc/dms-settings ]] && [[ $(_get_dms_env_value 'ENABLE_RSPAMD') -eq 1 ]]; then
-  /usr/local/bin/rspamd-dkim "${@}"
-  exit
+  if [[ $(_get_dms_env_value 'ENABLE_OPENDKIM') -eq 1 ]]; then
+    log 'error' "You enabled Rspamd and OpenDKIM - OpenDKIM will be implicitly used for DKIM keys"
+  else
+    /usr/local/bin/rspamd-dkim "${@}"
+    exit
+  fi
 fi
 
 KEYSIZE=2048