UX ONLY: Preset container registry

[uxarya-d]

Summary

Provide a preset container registry which users can use to play around with devtron.

Motivation

Reduce friction in experiencing devtron

Proposal

Provide a preset container registry.

• This registry will be used for sample applications. (registry settings will not be editable)
• Users can also use this registry in their own applications. (user can specify Dockerfile path)
• While triggering a deployment: Let users know if an image is stores in preset registry
• While triggering a deployment: Restrict users from selecting images which might have been removed from preset registry (based on time elapsed since image was saved in registry)

NOTE: Preset registry will store images for a finite time period after which they will be removed automatically.

AB#29