Migrate to GitHub Actions.

[jezdez]

Travis CI has a new pricing model which places limits on open source.

• https://blog.travis-ci.com/2020-11-02-travis-ci-new-billing
• https://www.jeffgeerling.com/blog/2020/travis-cis-new-pricing-plan-threw-wrench-my-open-source-works

Many projects are moving to GitHub Actions instead, including Jazzband projects:

• https://github.com/orgs/jazzband/projects/1
• Should we disable travis? help#206

This is based on jazzband/contextlib2#26.

Fix #329.

TODO:

• @jezdez to add JAZZBAND_RELEASE_KEY to the repo secrets.

[Natim]

I'm currious of why removing the Makefile though?

[jezdez]

I'm currious of why removing the Makefile though?

Not a huge reason other than Makefiles tend to collect dust and it doesn't map to the tox config as nicely, adding duplication. I can re-add it though, no strong feelings other than "let's get this migrated".

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@b73c832). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #340   +/-   ##
=========================================
  Coverage          ?   88.50%           
=========================================
  Files             ?        6           
  Lines             ?      287           
  Branches          ?       50           
=========================================
  Hits              ?      254           
  Misses            ?       15           
  Partials          ?       18           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b73c832...5e8e40c. Read the comment docs.

[jezdez]

@Natim I've added a separate workflow for running pre-commit but wondered if you'd be interested in trialing the use of https://pre-commit.ci?

[claudep]

Thanks a lot for working on this. I'm not yet familiar with GH actions, so I'm mostly trusting you!

[jezdez]

Thanks a lot for working on this. I'm not yet familiar with GH actions, so I'm mostly trusting you!

Thank you, this is a pretty conservative way to do GitHub Actions, and we have now ~40 other Jazzband projects doing a very similar setup. I'm a bit more skeptical to have a 3rd party service for pre-commit (since it's what has screwed us with Travis CI), but since it's from the pre-commit author I think it may be worth a shot.