Add vfkit to brew

[cfergeau]

More projects than just crc are using vfkit (podman, #38, ...). Having vfkit available in brew would make it a lot easier to install.
I made a formula as part of crc-org/crc#3476 , it's still available at https://github.com/cfergeau/homebrew-crc

This needs to be submitted upstream.

[cfergeau]

At the moment, vfkit can be installed with:

brew tap cfergeau/crc
brew install vfkit

[nirs]

At the moment, vfkit can be installed with:

brew tap cfergeau/crc
brew install vfkit

But it provides only 0.5.1. This breaks with my script:

Error: unknown option for usb-mass-storage devices: readonly

Can you add 0.6.0 to your brew tap?

[cfergeau]

Can you add 0.6.0 to your brew tap?

There was an open PR for this, it's now merged.