GitHub integration check falsely reports gist creation issues

[bedroge]

I'm getting the following when running eb --check-github with a personal access token that really has the proper gists permission:

Checking status of GitHub integration...

Making sure we're online...OK

* GitHub user...bedroge => OK
* GitHub token...ghp..MW0 (len: 40) => OK (validated)
* git command...OK ("git version 2.31.1; ")
* GitPython module...OK (GitPython version 3.1.18)
The authenticity of host 'github.com (140.82.121.3)' can't be established.
ECDSA key fingerprint is SHA256:p2QAMXNIC1TJYWeIOttrVc98/R1BUFWu3/LiyKgUfQM.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
* push access to bedroge/easybuild-easyconfigs repo @ GitHub...OK
* creating gists...FAIL (gist_url: https://gist.github.com/bedroge/6e0503bc018f7de1a7d63f3e994b0c71)
* location to Git working dirs... OK (/home1/p251204/easybuild)

One or more checks FAILed, GitHub configuration not fully complete!
See http://easybuild.readthedocs.org/en/latest/Integration_with_GitHub.html#configuration for help.

Status of GitHub integration:
* --from-pr: OK
* --new-pr: OK
* --review-pr: OK
* --update-pr: OK
* --upload-test-report: not supported

@branfosj just confirmed he's seeing the same issue. Interestingly, things seem to work fine anyway (it uploaded this test report right after running the above command: easybuilders/easybuild-easyconfigs#17610 (comment)), so it looks like there's something wrong with this check.

[branfosj]

We match on

re.match('https://gist.github.com/[0-9a-f]+$', gist_url)

However, the gist_url now includes github username: https://gist.github.com/branfosj/b4087b3584dd92133f3bbc1d995759b6

[branfosj]

Changing it to

re.match('https://gist.github.com/%s/[0-9a-f]+$' % github_user, gist_url):

seems to solve the issue.