Feature/maintenance-page

Changes

• add maintenance-page, only 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 platform anymore
• kaapana-base-chart
  • copy of admin without charts under platform-chart requirements
  • works as standalone, possible to install/uninstall platform-chart in /maintenance
  • platform-chart is not automatically copied under /platforms yet, has to be packaged and copied manually
• kaapana-platform-chart
  • if installed separately (as helm_namespace=services), namespace.yaml for services should be deleted
  • kaapana-plugin is under requirements.yaml now and not in preinstall_extensions
• kube-helm and Extensions.vue fixes for multiple version issue, non-responsive buttons, duplicate rows, cache for multiinstallable, kubeStatus and 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://10.128.130.133/maintenance/#/platforms
• for admin-chart only (default way) : https://10.133.28.41/

TODOs for release

• chart upload check admin namespace or not (commented out for this merge, not stable)
• container upload stop/continue (commented out for this merge, not stable)
• extension_params form UI fix (especially for multi selectables)
• /platforms: chart upload
• /platforms: add cache (currently takes ~30s to update)
• /platforms: remove ingress links

TODOs after release:

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