Proposal: Skip installation when attic in PATH

[pfzetto]

Hello,
I'm currently trying to use this action on a "host"-runner.
Sadly the installation of attic using the script doesn't work, but I can add attic to the PATH using the provided flake.

It would be nice if the action would skip the attic installation if the binary is already present.

What do you think? I would be happy to implement the feature if you are ok with it.

[ryanccn]

I think that's a very good idea 👍