feature/maintenance-page

Changes

• add maintenance-page, accessible under /maintenance
• add container upload
• kaapana-admin-chart
  • still the default option, now includes /maintenance as well
  • kube-helm and auth-backend is directly under this chart and not under kaapana-platform anymore
  • kaapana-platform-chart is deployed via preinstall script
• kaapana-base-chart
  • basically the admin-chart without the platform-chart
  • works as standalone, possible to install/uninstall platform-chart in /maintenance
• kaapana-platform-chart
  • kaapana-plugin is under requirements.yaml now and not in preinstall_extensions
  • also included in collections for other platforms to install/uninstall it
• kube-helm and Extensions.vue fixes for multiple version issue, non-responsive buttons, duplicate rows, cache for multiinstallable, kubeStatus and much more
• auth-check service now has helm_namespace prefix, since it should run for admin-chart, base-chart and platform-chart

Instances

• for base-chart and platform-chart : https://10.128.129.79/maintenance/#/platforms
• for admin-chart only (the default way) : https://10.133.28.41/

TODOs for release

• delete serviceaccount.yaml from kaapana-base-chart. It caused traefik & oauth to stuck in init state for some reason
• chart upload check admin namespace or not (commented out for this merge, not stable)
• (maybe) /platforms: add cache (currently takes ~30s to update)

TODOs after release:

• ExtensionManager for different types of extensions with their own state management and folders (platforms, stable, experimental)
• multiple platform instance support
• tbd