dockerimages cleanup triggers an error in the test for the gallery

[ReimarBauer]

Starting job container
  /usr/bin/docker pull openmss/mss-test:latest
  Error response from daemon: pull access denied for openmss/mss-test, repository does not exist or may require 'docker login': denied: requested access to the resource is denied
  Warning: Docker pull failed with exit code 1, back off 8.5[16](https://github.com/Open-MSS/MSS/actions/runs/4620278106/jobs/8170152193?pr=1734#step:2:19) seconds before retry.
  /usr/bin/docker pull openmss/mss-test:latest
  Error response from daemon: pull access denied for openmss/mss-test, repository does not exist or may require 'docker login': denied: requested access to the resource is denied
  Warning: Docker pull failed with exit code 1, back off 7.56 seconds before retry.
  /usr/bin/docker pull openmss/mss-test:latest
  Error response from daemon: pull access denied for openmss/mss-test, repository does not exist or may require 'docker login': denied: requested access to the resource is denied
  Error: Docker pull failed with exit code 1