Replace Docker Hub with GitHub Container Registry

[flavioheleno]

As discussed in #297, this PR replaces all https://hub.docker.com/u/parallelphp images with ghcr.io/krakjoe.

It also adds a new workflow called "docker" that builds such images.

Closes #297.

[flavioheleno]

@realFlowControl the pipeline will fail due to both b57b811 and 8814dfd requiring the images that are built by a1ea32e. I can split this PR in two parts to avoid this if you think it is a better approach.

[flavioheleno]

You may need to manage write and read access of GitHub Actions for packages in the repository settings.

[realFlowControl]

Nargh crap, I do not have these access rights in the repo here to do that. I try and reach out to @krakjoe and see if he can enable this (or alternatively grant me access to DockerHub, although I'd favour the GitHub Registry).

[realFlowControl]

Got it, the problem was that {{ github.actor }} is the user that initially triggered the workflow, in that case you, but you do not have the corresponding rights. So I pushed your .github/workflows/docker.yml to the develop branch and manually triggered the run at https://github.com/krakjoe/parallel/actions/runs/9112014983 some builds are still failing ...

[realFlowControl]

Hmm, restarting the failed tests helps, might be a race condition, but we should definitely check if the containers are correct or if there is a collision somehow

[realFlowControl]

@flavioheleno we might need to add an authentication step

[flavioheleno]

@flavioheleno we might need to add an authentication step

to asan and linux workflows, right?

[realFlowControl]

I think so, lets try it

[flavioheleno]

Success :)

[realFlowControl]

Whoop Whoop, that is so awesome!
Thank you very much for stepping up @flavioheleno 🎉

Regarding the other PRs you had open, feel free to update those, but beware that I'll be on vacation from Saturday on and will not be able to review/merge anything.

[flavioheleno]

no worries, it's important to take some time off. I'll update them and leave them sit here until you're able to take a look.