twisted started to use `attr.s(eq)` argument which was added recently,
so it fails with oldattrs. One of the CI jobs ran twisted and oldattrs
together, so it started to fail.
Move the twisted code to be covered by another job, and remove it from
the job with the oldattrs.
This often might be causing for jobs to take longer than 10 minutes,
which is a timeout Codecov uses to wait for successful CI.
Also it is good in general to have CI finish faster, of course.
This overwrites the `codecov.yml` file in the root of the repository with
`codecov-upstream.yml` file (which contains the code-cov token)´, so PRs
and branches on the repository can upload coverage.
Suggestion from here:
https://github.com/pytest-dev/pytest/pull/6421#issuecomment-571934112
Security concerns: the token might be misused, but only to upload bogus coverage
to `codecov.io`, so the team believe this is harmless. If we decide to fallback
from this decision , we just need to revoke the token.
Related to #6369
This includes our current full matrix (windows, linux and macos), for evaluting
purposes.
We should disconsider failures when evaluating PRs.
TODO:
- deploy
- coverage
- github release notes
Even with the above missing, I still believe it would be nice to merge
this and have GitHub actions working in parallel so we can evaluate performance
and usability from now on.