gitlab: fix logic for changing docker tag on stable branches

gitlab: fix logic for changing docker tag on stable branches

This fixes:

  commit e28112d00703abd136e2411d23931f4f891c9244
  Author: Daniel P. Berrangé <berrange@redhat.com>
  Date:   Thu Jun 8 17:40:16 2023 +0100

    gitlab: stable staging branches publish containers in a separate tag

Due to a copy+paste mistake, that commit included "QEMU_JOB_SKIPPED"
in the final rule that was meant to be a 'catch all' for staging
branches.

As a result stable branches are still splattering dockers from the
primary development branch.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Tested-by: Michael Tokarev <mjt@tls.msk.ru>
Message-ID: <20240906140958.84755-1-berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>