Michel Dänzer authored Nov 29, 2019 and Michel Dänzer committed Dec 02, 2019

Instead of just `$CI_JOB_ID` (the job's unique ID number), name the job
tags `<base tag>-built-by-job-$CI_JOB_ID`. This way, both tags are
sorted next to each other, making it easy to match them up on the GitLab
Container Registry page.

Also, instead of copying one tag to the other with `skopeo copy`, just
push both tags separately with `podman push`, to avoid failures which
have been occurring with the former.

Signed-off-by: Michel Dänzer <mdaenzer@redhat.com>