Fu Zhang authored Mar 16, 2022 and Stan Hu committed Mar 16, 2022

This adds the Harbor package registry as an optional project
integration.

When enabled, this integration adds the following environment variable
that CI jobs can use to download images from Harbor:

* `HARBOR_URL`
* `HARBOR_PROJECT_NAME`
* `HARBOR_USERNAME`
* `HARBOR_PASSWORD`

Part of https://gitlab.com/groups/gitlab-org/-/epics/7650

Changelog: added