Refactor workflows to separate different conditions

[suvayu]

Summary

• Update actions to latest versions
• Add flowchart documentation about workflow structure
• Factor out testing to a reusable workflow. Remove "if skip" checks in between steps, making the logic linear and easier to follow
  • Fix a bug in the windows installation step, earlier it was installing one wheel at a time. This could inadvertently pull in already published version of dependent (spine) packages. Installing with a single pip install *.whl means spine dependencies are satisfied locally, no risk of pulling in unknown versions from PyPI.
• Factor out build & download to composite local actions, similar to above, this makes the "if skip" condition simpler (in this case reduced to a single if skip: download else: build)

Testing of the action in the toy repo can be found here.

Unfortunately I had to delete the new tags from the example repos (scm*) otherwise it interferes with the unit tests here. I need to come up with a better way to setup the unit tests 🤔.

Deleted tags on scm*:

• scm: 0.7.3, 0.7.4
• scm-dep: 0.2.4
• scm-base: 0.3.3

Related

Supersedes #23

[soininen]

I'm not an expert on GitHub actions, but by a cursory look, the changes seem sound. I guess I'll see how they work in real life next time I need to release new Toolbox :) Nice work!

[suvayu]

Thanks! I did quite a bit of testing on the toy repo. Actually, that pip install *.whl issue on Windows, I found it since I was using test.pypi.org there! So I'm fairly confident; famous last words 😶‍🌫️ We'll find out