Add steps for alternative Docker VMs

[tspearconquest]

Hello! The VM created by Docker Desktop on MacOS seems to properly work with MITM proxies, however I found today that for people not using Docker Desktop, but instead using a different VM like Colima, you may need to manually add the proxy certificate to the VM.

For Colima, the steps are detailed in the below issue, and I hoped to make those steps more visible by sharing them here, as it took a fair bit of digging to come to this issue:

abiosoft/colima#131

Would you consider adding the steps for Colima from this issue to the readme?

Edit: Also I want to add that in MacOS Sequoia, Keychain Access is now hidden from Search. You have to open Finder and navigate to the path /System/Library/CoreServices/Applications then double click on Keychain Access, and then click on "Open Keychain Access" when prompted whether to use the Passwords app or Keychain Access app.