fix(build): fix pipeline

[RafalSkolasinski]

What this PR does / why we need it:

Customization of registry needs a deeper thought as it did not work straight after porting.
Had to do this change to get it working for the release branch.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[sakoush]

lgtm

[seldondev]

failed to trigger Pull Request pipeline

• failed to create agent
• failed to calculate in repo config
• failed to load trigger config for repository SeldonIO/seldon-core for ref
• failed to switch to ref
• failed to merge repository SeldonIO/seldon-core
• failed to run command in dir /var/tmp/gitrepo3773906085
• git, [merge FETCH_HEAD]
• Updating cfe54e2..6a45b2b
  error
• Your local changes to the following files would be overwritten by merge:
  .github/workflows/images.yml
  Please commit your changes or stash them before you merge.
  Aborting
• exit status 1