dock role depends on homebrew role for installation

[Nothing4You]

Hi,

the dock role documentation states that the geerlingguy.homebrew role is just a soft dependency, but it isn't clearly explained what is meant by that. Based on the readme my assumption was that it was only needed if Homebrew wasn't installed, but this is actually a strong dependency when dockutil_install is true:

TASK [geerlingguy.mac.dock : Install dockutil.] **************************************************************************************
ERROR! The requested handler 'Clear homebrew cache' was not found in either the main handlers list nor in the listening handlers list

Maybe add a note to dockutil_install that it has a strong dependency on geerlingguy.homebrew?

[geerlingguy]

The idea of a soft dependency is you could inject your own homebrew role if you wanted — it would still need to include a Clear homebrew cache handler. It might be good to document that more explicitly, though.

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