Limit build trigger folders for monorepo builds

[lsei]

I currently have a monorepo with 3 projects. Every time I push code to main all projects are built. The root directory for each of the projects is different.

Is there a way to limit the builds to only trigger when files in a project's root directory have changed?

If so, is it then possible to build all projects if files in a common folder are changed? (this is the current behaviour since everything builds on every push anyway)

Folder structure

/
├ common/ # changes should trigger all projects to rebuild/deploy
├ project1/ # changes should only build and deploy project 1
├ project2/ # changes should only build and deploy project 2
└ project3/ # changes should only build and deploy project 3

I've seen tangential discussions on here but haven't found this exact issue discussed.

[samcx]

@lsei You can use Ignore Build Step to achieve this.

[anthonyshew]

Vercel can now skip unnecessary monorepo builds: https://vercel.com/changelog/automatically-skip-unnecessary-deployments-in-monorepos