* I recently setup my M1 mac and had a similar problem to this issue
reported here https://github.com/thoughtbot/dotfiles/issues/702
The fix for me was to do what homebrew says after the install which is
to add to or create a .zprofile with the following command
`eval "$(/opt/homebrew/bin/brew shellenv)"`
* Introduce a zprofile with commands to eval homebrew on mac or linux if
the homebrew directory exists
