[CI] Workflows take too long to complete

[ubgk]

In our current setup, workflows take too long to finish.

We should check what can be cached across builds to speed up the process.

[stephane-caron]

Workflows do take time :sweat_smile: I haven't felt the need to speed them up so far, since with Bazel we can run them locally, and there hadn't been many cases where a workflow would fail remotely but not locally (well, currently there's one with clang-format...).

I agree we could use some caching :+1: As long as it doesn't break local workflows (nor adds too much extra complexity) it sounds like a net productivity improvement.

[pgraverdy]

I tested on my side for the CI workflow and I can get workflows to have workflow finish 50% faster using caches

• using cache per job and branch/PR (with keys)
• currently runs only on PR into main
• first run in PR still takes 4 minutes

Check https://github.com/pgraverdy/upkie/actions (CI job # 42 vs # 41)

@ubgk What was the issue with the other PR ?

[stephane-caron]

Closing this issue as of archiving this project. Feel free to continue the discussion in upkie if new elements come to light!