syncpack GHA fails if `npm -g` permission denied

My org is running GHA action runners without root access, which means that `npm install -g` returns permission denied, and this is causing the syncpack GHA to fail (because it always installs syncpack with `-g`). Would you be interested in a PR that adds a config option for whether `npm install` is run with `-g` or not?

(Yeah, there are other ways to solve this problem long-term, like using `bun`, but I am trying to keep this simple.)

Comienza en el punto de entrada de la GitHub Action y localiza el comando que instala syncpack con npm. Añade una opción de configuración que controle si la instalación utiliza el flag global y, después, verifica que la action pueda ejecutarse en un runner sin acceso root.

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