I notice that your pages job is currently failing, and that the last attempt to fix it was a year ago by Raphael. It seems that this all got rather less complicated at some point (presumably due to added cleverness from the salsa-CI team :-) ) so I appear to have fixed it by removing things.
I don't know why, but it seems that it needs the except: variables: ... bit for the pages/pages_deploy jobs to be instantiated.
One could make it shorter still by replacing the two include lines with this:
- https://salsa.debian.org/salsa-ci-team/pipeline/raw/master/recipes/debian.yml
so, if you like that I can do it as well.
Cheers, Phil.