List of supported Drupal versions with new CRD

Retrieve all latest versions for each DrupalSite version.

• Add new cluster scoped CRD
• Add new controller
• [x] Add HTTP Handler

Controller's logic:

• Get, parse and sort v... tags from GitLab registry
• Update status of DrupalSite version resource
• [x] Trigger reconciliation with GitLab Webhook: Type of Webhook: Pipeline Events
  • [x] Add secret for GitLab API Token
  • [x] Add service
  • [x] Add route in okd4-install
  • Create empty SupportedDrupalVersions Resource in okd4-install
• Add condition in CRD to check gitlab's API availability: #76 (closed)
• Add periodic reconciliation (every 1h)

partial https://gitlab.cern.ch/webservices/webframeworks-planning/-/issues/517