Read-only access token

[dtinth]

Hello, thanks for this project!

I came from Rushjs background and they have this feature where the cache is writable by CI systems but read-only for developers on their workstation. Quoting their docs:

In a typical setup, the CI system would be configured to write to cloud storage, and individual users are granted read-only access. For example, each time a PR is merged into the main branch, the CI system builds that baseline and uploads it to cloud storage. Even for a user who is doing git clone for the first time, their rush build will be very fast.

It’d be great if turborepo-remote-cache has a flag to allow some tokens to read from the cache but not write to it.