test-update branch: commit should happen only if certificates have changed

[dolmen]

It is not helpful to have automated commits of regeneration where no certificates changes happened, but instead only timestamp changes.

So the Github Actions workflow should check that the diff has at least more than 2 lines that changed.

[mattrobenolt]

Yeah, my plan was to just keep a file that was the hash of the certificate content, and compare to that on each run. Similar idea, and a bit better of a test than checking number of changed lines.

I just haven't had any motivation to do it to be honest.

[tmm1]

Friendly ping