Merge branch 'expose-database-url-when-postgres-release-exists' into 'master'

Expose database URL if a Postgres release exists

See merge request https://gitlab.com/gitlab-org/cluster-integration/auto-deploy-image/-/merge_requests/321



Merged-by: Hordur Freyr Yngvason <hfyngvason@gitlab.com>
Approved-by: João Alexandre Cunha <j.a.cunha@gmail.com>
Approved-by: Hordur Freyr Yngvason <hfyngvason@gitlab.com>
Co-authored-by: Tiger <twatson@gitlab.com>