feat: configure gitlab groups from external oidc groups

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LGTM, suggest we add this comment to the addons.gitlab.sso section as a guide:

      # Uncomment this block and populate with Keycloak groups according to your desired Gitlab membership requirements
      # Legend
      #   requiredGroups - groups that must be included in the Keycloak response for the user to be granted access to Gitlab
      #   externalGroups - groups that must be included in the Keycloak response for the user to be identified as an external Gitlab user (see https://docs.gitlab.com/ee/administration/external_users.html)
      #   auditorGroups - groups that must be included in the Keycloak response for the user to be added as Gitlab instance auditors
      #   adminGroups - groups that must be included in the Keycloak response for the user to be added as a Gitlab instance admin
      #   Full documentation: https://docs.gitlab.com/ee/administration/auth/oidc.html?tab=Linux+package+%28Omnibus%29#configure-users-based-on-oidc-group-membership
      #
      # groups:
      #   requiredGroups: []
      #   externalGroups: []
      #   auditorGroups: []
      #   adminGroups: []

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64329607 - add comment for gitlab group membership

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13f7f6ba - Merge branch 'master' into feat/gitlab-oidc-group-members

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marked this merge request as ready

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Tested with a local deployment of BigBang + GitLab and validated that gitlab-sso.json was rendered properly.

mentioned in issue big-bang/product/packages/gitlab#225 (closed)

@noahbirrer hello, would you be able to allow the option to configure value for "groups_attribute" as well? Because Keycloak groups are configured differently per project, and we want to be able to the use custom group name per my comment on the ticket

big-bang/product/packages/gitlab#225 (comment 1870729)

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this is the line I was referring to

!3842 (diffs)

Sorry for spamming

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4b6f9905 - add ability to config `groupsAttribute`

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6753793f - add note to docs about `groupsAttribute` [ci skip]

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Thanks for working this @noahbirrer I would like to re-work that comment to read a bit better and start with the formatting in the comment above. If you go off other SSO or extra values provided by a package we usually only have a 1 sentence blurb and a ref to upstream documentation so as not to add clutter to the values file.