Checks to Dockerhub return a 406

[EagleoutIce]

When we check links to https://hub.docker.com/r/<...> we get a 406 - Not Acceptable even though the links exist and work fine.

[becheran]

@EagleoutIce can you give me one example URL with /r? I guess the 406 means that the HEAD and later GET request is not accepted by the endpoint.

[EagleoutIce]

Sure! Specifically for us, https://hub.docker.com/r/eagleoutice/flowr fails.

[becheran]

@EagleoutIce I am not able to reproduce the issue. I added [foo](https://hub.docker.com/r/eagleoutice/flowr) in a markdown file and mlc did not detect any error:

[ OK ] .\README.md:3:1 => https://hub.docker.com/r/eagleoutice/flowr -

[EagleoutIce]

Yes, thank you very much for checking, it appears that the problem vanished automagically.

[EagleoutIce]

Ok, maybe this is a flakey github-actions issue, but we got the error again (https://github.com/flowr-analysis/flowr/actions/runs/10059706810/job/27805541854?pr=868#step:10:371)