ci: add path filters

[trueberryless]

Description

This PR adds path filters to all GitHub workflows to exit CI early when run is not necessary.

Here is some data of past runs from the last month and how much runs could have been skipped:

Workflow	Runs sampled	Would skip	Skip %	Avg dur	Min saved
ci.yml	84	13	15.5 %	3.5 min	50
ci-bun.yml	84	13	15.5 %	7.5 min	44
ci-legacy-5.0.4.yml	83	14	16.9 %	12.5 min	184
integration.yml	84	13	15.5 %	3.1 min	38
Total/Avg	335	53	15.8 %	6.7 min	~316 min / month

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/knip@1871

npm i https://pkg.pr.new/@knip/language-server@1871

npm i https://pkg.pr.new/@knip/mcp@1871

commit: 11353c7

[webpro]

This is great! Path filters LGTM. What is the difference with setting e.g. on.*.paths at the root level of a workflow config?

[trueberryless]

This is great! Path filters LGTM. What is the difference with setting e.g. on.*.paths at the root level of a workflow config?

I knew/hoped you would ask that 😅

The difference is that with on.*.paths the workflow is not even triggered whereas here it reports a successful status. This is important if you add a branch ruleset which has those workflows marked as required before merging. Doing it with on.*.paths would lead to PRs, where the CI should not trigger, hanging because the requirements are not met.

Does that make sense?

[webpro]

Thanks for clearing that up! The "if" is doing a lot of work here. Feels like we don't yet have any trait that warrant pulling in the extra complexity (actions + config). How about starting out with on.*.paths and expand on this idea as we go?

[trueberryless]

Thanks for clearing that up! The "if" is doing a lot of work here. Feels like we don't yet have any trait that warrant pulling in the extra complexity (actions + config). How about starting out with on.*.paths and expand on this idea as we go?

Good to know. I'll adapt it for now and if you enable auto-merge in the future, we just need to remember to change that 👍

[webpro]

Thank you! 🙏 This looks great.

[webpro]

🚀 This pull request is included in v6.26.0. See Release 6.26.0 for release notes.

Using Knip in a commercial project? Please consider becoming a sponsor.