Merge branch 'feat-worker-image' into 'master'

feat: adds ability to specify image for the workers

See merge request https://gitlab.com/gitlab-org/cluster-integration/auto-deploy-image/-/merge_requests/360



Merged-by: Hordur Freyr Yngvason <hfyngvason@gitlab.com>
Approved-by: Hordur Freyr Yngvason <hfyngvason@gitlab.com>
Co-authored-by: Mikhail Shevtsov <mikhail.shevtsov@wiregate.io>