Do not copy extra junk when installing dev build of porter #1547
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What does this change
The install target is a bit lazy and copies everything in certain directories. This results in files that do not need to be installed
copied into PORTER_HOME. For example, the release directories (dev, latest, tagged) for the exec mixin.
The extra binaries are a problem because it seriously bloats invocation images built on a dev machine.
This moves the logic to our magefile, and is more explicit about what we want to copy.
What issue does it fix
My chonky invocation images
Notes for the reviewer
I'm considering a follow-up that makes porter more selective when copying files into the invocation image, e.g. only the runtimes and not blanket copying the entire mixin directory for each mixin.
Checklist