fix: usermod command syntax

netoik-git.spec

@@ -26,7 +26,7 @@ Install the Git UI server called Forgejo (fork of Gitea).
 chgrp forgejo %{_sysconfdir}/forgejo/conf/netoik_app.ini
 
 # Add user forgejo to db groups
-usermod --groups postgres valkey --append forgejo
+usermod --groups postgres,valkey --append forgejo
 
 # Create postgres user and db
 if ! runuser --user=postgres -- psql --quiet --tuples-only --command='\du' | grep --quiet forgejo; then