Testing Git zero-config flow as PR checks

[svor]

Is your task related to a problem? Please describe

As a result of #20583, we've added a support for many git services (GitHub, BitBucket, GitLab)
It would be good to test the existing git flow as much as possible.

Describe the solution you'd like

Unit Test:

• Add unit tests into che-server to cover git providers functionality

Add instructions how to prepare Git servers to work with Che, it could be a part of https://github.com/eclipse-che/che-server repository or a new repo in https://github.com/che-incubator:

• BitBucket server (need to verify instructions described in https://github.com/skabashnyuk/gitsrv/tree/main/bitbucket)
• GitLab server
• GitHub server

Add GitHub action to get che-server image with a current PR number:

• Build and pull che-server image to quay.io/repository/eclipse/che-server with a curent PR number

Configure OpenShift CI infrastructure to run git functional tests as PR check:

• tests without PAT/OAuth setup flow:

• Bitbucket.org

• GitHub.com

• GitLab.com

• tests with PAT setup flow

• GitHub.com

• GitLab.com

[dmytro-ndp]

@svor, @vinokurig : there is downstream repo with working bitbucket server automation: https://gitlab.cee.redhat.com/codeready-workspaces/git-servers/-/tree/main/bitbucket, https://gitlab.cee.redhat.com/codeready-workspaces/crw-jenkins/-/blob/master/resources/disconnected/bitbucket_install.sh

[svor]

Thanks @dmytro-ndp for the links!

[svor]

@l0rd The instructions how to prepare Git servers to work with Che/DS were added into https://github.com/che-incubator/git-srv.
Should we add the link to this repo somewhere, maybe in docks?

[l0rd]

This is useful for contributors so my proposal is to add the link in a section of the contributing.md.

[vinokurig]

While investigating the GitHub action test flow I've faced a problem:
The initial idea is to send a Che API request and check the result. The Che Api is available only through the oAuth step. In case of Openshift it is the OpenShift oauth-proxy and in case of minikube it is Dax. So when I request Che API directly by curl it returns an authorisation html. So I don't see a way how to make an API request to Che to test the Che oAuth flow without using UI.

[l0rd]

some ideas to avoid using selenium in the automated tests:

• https://dzone.com/articles/automate-testing-oauth-20-service-a-step-by-step-t
• https://docs.github.com/en/developers/apps/building-oauth-apps/authorizing-oauth-apps#non-web-application-flow

[artaleks9]

• I think, this issue can be closed considering to merged PR's, see above.
• I'll create another issue where try to implement setup git provider/s OAuth to expand exist tests for Git-zero flow.