feat: make cacheDirectory configurable by env

[tomasz-sodzawiczny]

This PR contains a:

• [ ] bugfix
• [x] new feature
• [ ] code refactor
• [ ] test update
• [ ] typo fix
• [ ] metadata update

Motivation / Use-Case

Adds option to control the cacheDirectory with CACHE_LOADER_CACHE_DIR. Useful for keeping the default for local dev environment and controlling the value on CI/CD.

The cacheDirectoryoption still takes precedence if specified.

https://github.com/webpack-contrib/cache-loader/issues/91

Breaking Changes

Only changes behaviour if someone has the CACHE_LOADER_CACHE_DIR variable set in their environment - very unlikely it's a breaking change.

Additional Info

To do

• [ ] Add docs if feature accepted

[jsf-clabot]

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[alexander-akait]

Better open issue in find-cache-dir repo

[tomasz-sodzawiczny]

@evilebottnawi I was thinking about it, but doesn't seem to be a good idea.

It would also modify behaviour of other libraries that use it and it would expose a configuration API that even the developers wouldn't know about. Having a MY_PROJECT_CACHE_DIR variable without documenting it in a project it would be very confusing.

[alexander-akait]

@tomasz-sodzawiczny a lot of loaders/plugins use this package for cache, it will require changing their code, and still some loader will be use other cache directory internally (vendor loaders), so better discuss about this feature in find-cache-dir repo

[alexander-akait]

Implemented in find-cache-dir