Support read only filesystem

[MarcelCoding]

Clear and concise description of the problem

I use nixos, where build have a kind of read only file system. (only special folders, e.g. node_modules) Therefore they can not be written to.

The unfortunate is, that vitest has successfully executed all test, and is therefore "finished". Instead of just exiting, it tries to write to node_modules...

Suggested solution

Add an option to run in read only mode, where vitetest does not tries to write to disk.

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[hi-ogawa]

Did you try --cache=false or changing cache.dir? https://vitest.dev/config/#cache

Also Vite/Vitest might write to node_modules/.vite, which can be changed by https://vitest.dev/config/#server-deps-cachedir

Other than node_modules, there could be one more source of file writing for Vite config loading #4901

[MarcelCoding]

Thanks, setting --cache=false worked. Sorry, I did not find it in the docs.