When you’re working with in monorepo, Netlify will attempt to rebuild everything on every PR. This can be a problem if you’re soley working on one workspace and it builds another. By adding an ignore property to your netlify.toml, you can prevent this from wasting your build minutes.
[build]
ignore = "git diff --quiet $CACHED_COMMIT_REF $COMMIT_REF WORKSPACE_NAME"
Additional documentation from Netlify.