.github/workflows/ci-sage.yml: Update to Docker push logic

[mkoeppe]

We update the Docker push logic:

• use what is implemented in tox.ini
• prefix the package name with 'cysignals-' to avoid clashes with the packages pushed by Sage CI workflows
• use latest or dev Docker tags for release tags

[kliem]

It seems that the CI-workflow is currently broken, see tests #166.

 ./bootstrap: 161: ./bootstrap: ./bootstrap-conda: not found
Bootstrap failed. Either install autotools and gettext; or run bootstrap with
the -d option to download the auto-generated files instead.

In general, I hardly understand what is going on in this workflow anymore.

[mkoeppe]

This is fixed in https://trac.sagemath.org/ticket/33926

[kliem]

I see, so no need to update here. Great.

[mkoeppe]

I have merged #33926 into the ticket branch of the "CI target ticket for cysignals" #32579. So it will now be used by the workflow.

[mkoeppe]

Outdated