Refactor CI

[blink1073]

• Use new GitHub feature that allows us to call other actions from composite actions
  • Factor out as much logic as possible into actions
• Create a function to set up environment variables in python action helper modules
• Use local actions in workflows instead of targeting a tag
  • Easier to reason about, and it is easy to keep forks up to date through the GitHub UI

[codecov-commenter]

Codecov Report

Merging #182 (6090e72) into master (3c82022) will decrease coverage by 1.14%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #182      +/-   ##
==========================================
- Coverage   85.92%   84.77%   -1.15%     
==========================================
  Files          17       19       +2     
  Lines        2252     2273      +21     
  Branches      276      280       +4     
==========================================
- Hits         1935     1927       -8     
- Misses        222      250      +28     
- Partials       95       96       +1     

Impacted Files	Coverage Δ
jupyter_releaser/actions/check_links.py	0.00% <0.00%> (ø)
jupyter_releaser/actions/common.py	0.00% <0.00%> (ø)
jupyter_releaser/actions/draft_changelog.py	0.00% <0.00%> (ø)
jupyter_releaser/actions/draft_release.py	0.00% <0.00%> (ø)
jupyter_releaser/actions/publish_release.py	0.00% <0.00%> (ø)
jupyter_releaser/cli.py	91.30% <ø> (ø)
jupyter_releaser/tee.py	77.77% <0.00%> (-5.15%)	⬇️
jupyter_releaser/util.py	70.14% <0.00%> (-0.30%)	⬇️
jupyter_releaser/python.py	83.33% <0.00%> (-0.25%)	⬇️

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[blink1073]

@jtpio, mind reviewing this one? Specifically the fact that we would stop targeting the tagged version of actions in our workflows.

[jtpio]

Nice! It indeed makes sense to use local actions, more convenient when testing from a fork.

[jtpio]

Thank! 🚀

[blink1073]

Ah, it looks like relative links to actions don't work when used from other repos: https://github.com/ipython/ipykernel/pull/788/checks?check_run_id=3943113875