Run with actions/checkout@v3

[pancetta]

Hi! Very nice action, took me a while to find something like that, thanks a lot.

Just a note: if you want to/need to run this with actions/checkout@v3 instead of actions/checkout@v1, you need to specify fetch-depth: 0 in the checkout action. Otherwise this will result in the error

! [remote rejected] my_branch -> my_branch (shallow update not allowed)

when pushing to the mirror.