Expose on dashboard instructions how to configure Secrets/ConfigMaps for DevWorkspaces

[sleshchenko]

Is your enhancement related to a problem? Please describe

Currently, DWO allows to mount any secret/configmap into devworkspaces, but there is no any clue on dashboard.

Describe the solution you'd like

Instead of building fully functional UI on Dashboard, it's decided to move with just instruction how to do it with K8s cluster CLI.
It's STEP 1 from #17954

Describe alternatives you've considered

No response

Additional context

No response

[sleshchenko]

The simplest way to expose users info is the following
Please apply your suggestion on https://docs.google.com/document/d/1IR78XlxO37VTWXOu-uE-2nKC93D1GNhZomGoRaN518o/edit?usp=sharing

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DevWorkspaces allow mounting configmap and secrets as files or environment variables which enables you to use them as storage for your cross workspaces settings, like maven settings.
After you create them into your namespace, use the following configuration fragments to get it in your DevWorkspace:

As a file

metadata:
  labels:
    controller.devfile.io/mount-to-devworkspace: true
  annotation:
    controller.devfile.io/mount-path: /my/file

As env var:

metadata:
  labels:
    controller.devfile.io/mount-to-devworkspace: true
  annotation:
    controller.devfile.io/mount-as: env

[l0rd]

@ibuziuk this has milestone 7.39 but it hasn't been completed (because of unplanned work dashboard side I guess). I am removing the milestone since I don't think you have plans to work on it for 7.40 (not a DW milestone 3 priority).

[che-bot]

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