Enhancement: Automatic Alternate command detection | override system command

[LongLiveCHIEF]

Sometimes people name programs the same. A good example of this is packer, which is a popular image building tool from Hashicorp, but also exists in RHEL as a core binary that manages parts of the keyring.

whalebrew already supports custom command name configuration via the io.whalebrew.name label, however it would be great if whalebrew checked for the existence of that command during the install, and had some sort of option to automatically switch to an alternate command name, or an option to override the system command on the user path.

Example Use Cases

Ruby

Ruby is installed on every mac, but you should basically never use it when doing any project that utilizes Ruby, gems, rails, etc...

• There could be a io.whalebrew.options.override_system_binary label, or flag during install

packer

As described above, there is a conflict with packer, in that they're two totally different tools. Unlike the system conflict example for ruby, we can use any name for the packer command if the system already has packer on the system path.

• There could be a io.whalebrew.alternate_name that I could set to something like packerd

[LongLiveCHIEF]

This isn't the highest priority feature, but it would be a definite "nice to have". It would probably rely or is related to #17.