glab repo fork should have a --public flag to make the fork public
Problem to solve
As a developer, I want to make my forks public when I create them using the command line client.
Proposal
Add a --public flag to glab repo --fork, just as in glab repo create.
Further details
For now I need to go the the web UI to change the visibility afterwards.
I guess we could also add --internal, --private just as in glab repo create.