Support volumes for plugin components in devfile

[svor]

Description

It is necessary to add an ability to set volumes for chePlugin component. For example it is needed to mount the .m2 volume to the java plugin.

[svor]

It is needed for #13603

[skabashnyuk]

@svor what are the reason not to specify m2 volume in chePlugin in plugin registry?

[svor]

@skabashnyuk as for me devfile is better place to do that, where we can see whole configuration of workspace's containers and make changes in one place.

[skabashnyuk]

@skabashnyuk as for me devfile is better place to do that, where we can see whole configuration of workspace's containers and make changes in one place.

Apart from that, any other reasons?

CC @l0rd

[amisevsk]

Related: PRs #14539 and eclipse-che/che-plugin-broker#74 are working on adding volumes to plugin meta.yamls for issue #13387.

[sleshchenko]

Actually, volumes are already implemented for meta.yaml https://github.com/eclipse/che-plugin-registry/blob/master/v3/plugins/eclipse/che-theia/next/meta.yaml#L59. And Oleksandr just works on ephemeral workspaces which are needed for another task.
So, @svor I think from maven plugin point of view it makes more sense to define it on meta.yaml level and then:

1. every user should not define it in each of their devfile.
2. I assume maven plugin expects maven volume in the exact path, it does not value that user should care about.

As about supporting volumes for plugin components - maybe it makes sense but at this stage we don't have any real-world purposes for them, so maybe we should delay this issue until we see any needs in it.

[metlos]

Closing as duplicate of #13318.