Temporarily allow gitlab to pull in bitnami images from docker hub

Feature Request

Why

Currently the Gitlab chart is making use of a bitnami subchart for postgres. This database is only to be used for development purposes and not in a production manor. We use this database when we spin up Gitlab in the pipelines when working on renovates, etc.

With the most recent Gitlab renovate, the bitnami chart changed in such a way as to break our currently configured non bitnami Iron Bank postgres image we were using for this development testing. IB has bitnami postgres images, however they are currently not in feature parity with images produce by bitnami it self and as such cause errors when trying to match them with the bitnami subchart.

Proposed Solution

Add a Kyverno policy exception for gitlab to allow it to pull in the appropriate bitnami docker image until such time as the Iron Bank bitnami images are updated.

This issue is currently blocking a high priority GItlab renovate from being completed. The renovate fixes a High CVE with Gitlab.