Support overriding Che Theia plugins preferences and sidecar through .che/che-theia-plugins.yaml

[l0rd]

Is your enhancement related to a problem? Please describe

There is an issue to apply vs code extension preferences specified in the plugin registry (for che-theia plugins).

This issue is about overriding vs code extensions preferences using the file .che/che-theia-plugin.yaml in the git repository.

Describe the solution you'd like

If the file .che/che-theia-plugin.yaml in the git repository exists we should use it to override the spec of the plugins.

For example if the file .che/che-theia-plugin.yaml exist at the root of the repository:

- id: redhat/java8/latest
  override:
    preferences:
      java.server.launchMode: LightWeight
    sidecar:
      memoryLimit: 1280Mi 

the che-theia plugin should be included in the workspace and its default preferences and sidecar specification should be merged with the one in the file.

Describe alternatives you've considered

No response

Additional context

No response

[sleshchenko]

Does it include supporting overriding stuff from the editor? Like memoryLimit for theia from .che/editor.yaml...

[benoitf]

This issue is only target Che theia plug-ins so not the editor

[benoitf]

today you can add a custom .che/che-editor.yaml file that is defining (not overriding) your own editor (and then your own memory)

[sleshchenko]

but https://che.eclipseprojects.io/2021/10/12/@mario.loriedo-devfile-v2-and-the-devworkspace-operator-p1.html says it's possible to override just memory for editor, and we even don't have an issue for that

[max-cx]

Hi, a question to the assignee of this issue:

Will the outcome require any changes to the relevant content of the Installation Guide or Administration Guide or End-user Guide?

Yes/No?

[svor]

There should be new documentation for End-user guide, I think it should be done by developer who will implement this functionality.