Symptom. git push fails with "rejected, fetch first" right after a run, although nobody else pushed.
Cause. Every conformity run commits conformity/latest.json and conformity/index.html as conformity-bot with [skip ci]. Your local main is one commit behind.
Fix
git pull --rebase
git push
The bot only touches those two files, so the rebase does not conflict unless you edited them by hand. The conformity page is generated; edit its configuration (conformity/site-tier.json) instead.