Merge main into gateway/integration every weekday with a --no-ff merge
commit; abort a conflicting merge and open a sync/<source>-<date> pull
request listing the conflicting files instead. Run ci.yml on pull requests
that target gateway/integration so the branch ruleset's required checks can
report, and document both in the CI gate matrix.
Refs rustfs/backlog#2736, rustfs/backlog#2734