mount ~/.tart/cache directory when running vms

[zshannon]

I'm building a project with 2-3 GB of DerivedData and SPM cache, which doesn't work well getting tarballed and shipped to/from the Github cache, so I'm exploring more performant options. I still need to think through lock type stuff for a good solution here, but having a persistent directory from the host available on the VM is a solid start for me here :)

Description

Creates a cache directory in the tart home and mounts it on run in virtual machines at /Volumes/My Shared Files/cache.

Motivation and Context

See above but basically I want to cache files between builds to speed up SPM

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)