Remove empty space

docker-compose.yml

@@ -60,7 +60,7 @@ services:
         - dkim-vol-1:/data/dkim
         - rspamd-vol-1:/var/lib/rspamd
       restart: always
-      dns: 
+      dns:
         - 172.22.1.254
       dns_search: mailcow-network
       networks:
@@ -174,7 +174,7 @@ services:
         - "${SUBMISSION_PORT:-587}:587"
       restart: always
       hostname: ${MAILCOW_HOSTNAME}
-      dns: 
+      dns:
         - 172.22.1.254
       dns_search: mailcow-network
       networks: