Add a way to run scripts from workspace root using `--filter`

[hyoretsu]

What is the problem this feature would solve?

I recently had to create a script that had to build other packages before running it, which was a script in the workspace root. The script ended up being cd ../ && bun build:extension && cd ./frontend && shopify app dev --skip-dependencies-installation

What is the feature you are proposing to solve the problem?

Adding some reserved word to express workspace root for --filter. Maybe a "_"? bun -F _ build:extension

What alternatives have you considered?

No response

[hyoretsu]

Specifically in my case I realised that I can convert the workspace script to a package script, but it would still be useful to have a single workspace build script that builds multiple packages and have that ran in a package.

Eg: having a root format script and call it inside of a package's script like format ./src

[mags-sully]

This is how im running workspace scripts globally:

    "lint": "bun run --filter '*' lint",