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on osd in the home directory of "geekotest" there is a directory ~/.ssh which contains:

authorized_keys  config  id_rsa  id_rsa.gitlab  id_rsa.gitlab.pub  id_rsa.pub  known_hosts  known_hosts.old

IIUC nicksinger has added the key "id_rsa.gitlab id_rsa.gitlab.pub" under the account "nicksinger" on gitlab.suse.de so logging in to gitlab.suse.de greets with "nicksinger" but that account is blocked at time of writing, see #75067

I just commented out the section in ~/.ssh/config to use ~/.ssh/id_rsa.gitlab so git+ssh uses "id_rsa" which is already supplied as a valid key for the gitlab user "openqa-pusher". Then in ~/share/tests/sle/products/sle/needles the command git pull --rebase origin master && git push worked because the account "openqa-pusher" is not blocked.

EDIT:
I don't think we actually currently need the specific "gitlab" ssh keys as we have the generic one already added to gitlab and renamed the gitlab one to make it obvious it's unused:

mv id_rsa.gitlab{,.unused}
mv id_rsa.gitlab.pub{,unused}

However to include that into salt I think it's safer to use a dedicated key anyway. On osd as geekotest I did ssh-keygen -t ed25519 -N '' -C 'geekotest@openqa.suse.de, openqa-pusher needle pushing to gitlab' -f id_ed25519.gitlab,
added the public key in https://openqa-pusher@gitlab.suse.de/profile/keys and included the files into the pillars repo

cd ~/local/openqa/salt-pillars-openqa/hosts/openqa.suse.de
ssh osd "sudo -u geekotest cat /var/lib/openqa/.ssh/id_ed25519.gitlab.pub" > id_ed25519.gitlab.pub
ssh osd "sudo -u geekotest cat /var/lib/openqa/.ssh/id_ed25519.gitlab" > id_ed25519.gitlab

and reference in salt-states-openqa, e.g.

105 {% for i in ['', '.pub'] %}
106 /var/lib/openqa/.ssh/id_ed25519.gitlab{{i}}:
107   file.managed:
108     - contents_pillar: id_ed25519.gitlab{{i}}

cat config 
Host gitlab.suse.de
  User gitlab
  IdentityFile ~/.ssh/id_ed25519.gitlab
  IdentitiesOnly yes

https://gitlab.suse.de/openqa/salt-pillars-openqa/-/merge_requests/267
and
https://gitlab.suse.de/openqa/salt-states-openqa/-/merge_requests/388

generated config on osd looks fine, everything seems to work as expected.