chore: Apply git user data configmap to mount to /etc/gitconfig

[vinokurig]

What does this PR do?

Add a workspace provisioner that checks registered git oAuth providers. When first provider found, a configmap with git user data, fetched from the corresponding git service, with mount to /etc/gitconfig is created.

Screenshot/screencast of this PR

What issues does this PR fix or reference?

eclipse-che/che#20938

How to test this PR?

1. Deploy che to a cluster: chectl server:deploy --platform=openshift -i=quay.io/ivinokur/che-server:next
   where quay.io/ivinokur/che-server:next is che-server image built from the PR.
2. Configure GitHub oAth
3. Start a factory from a private GitHub repo e.g. https://github.com/vinokurig/test-extension/tree/devfile2
4. Check that workspace-userdata-gitconfig configmap is created in the user namespace:

kind: ConfigMap
apiVersion: v1
metadata:
  name: workspace-userdata-gitconfig
  namespace: <user namespace>
  labels:
    controller.devfile.io/mount-to-devworkspace: 'true'
    controller.devfile.io/watch-configmap: 'true'
  annotations:
    controller.devfile.io/mount-as: subpath
    controller.devfile.io/mount-path: /etc/
data:
  gitconfig: "[user]\n\tname = <username>\n\temail = <email>"

Tested with github.com. Didn't test with gitlab and bitbucket as only on-premises versions are supported.

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[amisevsk]

LGTM but did not have a chance to test.

[svor]

Tested as described in the description with my private repo on GitHub, works as expected:

[skabashnyuk]

What would be the way for the user to override this information?

[svor]

What would be the way for the user to override this information?

one of the possible way is Theia preferences:

[skabashnyuk]

Cool thanks