use a fork of the github action

[sdushantha]

My fork does not delete all contents

[ppfeister]

Wow, you'd think a destructive action like that would use a flag. I wonder if there's a way to use actions with a patch series rather than a fork, to keep up with changes....... that's a future problem, though, if ever.

[sdushantha]

@ppfeister There is an issue about it here: cpina/github-action-push-to-another-repository#61

So a flag may come in the future once the tests are fixed