Set up GitLab CI testing matrix so multiple core compatibility is tested

Gábor Hojtsy → credited jonathan1055 → .

@jonathan1055 helped on slack to optimize the 1.x version with less copied from the main yaml.

Thanks for giving me the credit. I was interested to see what you ended up with, so just had a look, and the commit on 1.x above does not actually have the !reference [ ] lines, it contains all the duplicated aliases. Maybe you used the online code editor to make changes to the file, but this was not actually what got commited? I have used the online editor a few times, I don't know if those changes get permanently added to the MR branch. Or maybe you pushed from a local copy instead?

Just checked your actual source code and it have the reference lines, so ignore what I said above. You must have made them in a separate commit afterwards.

Yes, I made followup commits that were not associated with this issue and were not on this MR. After I merged the MR :)

Automatically closed - issue fixed for 2 weeks with no activity.