There's a merged pull request on the void-packages repository

[RFC] .github/workflows/build.yaml: only run on changes in srcpkgs/
https://github.com/void-linux/void-packages/pull/36695

Description:
Currently, this workflow runs on every pr (and push to branches called `ci-*`). This doesn't give any useful information for changes that only affect other parts of the repo, like common, xbps-src, documentation, etc.