Allow to configure cache path for webpack

Kamil Trzcińskirequested to merge
allow-to-configure-cache-path into master

What does this MR do?

This allows configuring Webpack and Bootsnap to use different cache directory, which today is tmp/cache.

I use it to have extra configurability for GitLab Compose Kit for Mac workflow.

Does this MR meet the acceptance criteria?

Edited by Kamil Trzciński

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