Before the change over to gitlab, I had set up a git post-receive hook so that all commits were sent to the cmucl-commit (and cmucl-cvs) mailing lists. (The hook also automatically updated a trac issue, but that seems not necessary anymore with gitlab.)
I can't seem to find out how to do that now. There's a page on web hooks, but I can't easily tell what I'm supposed to do with that. I just want each commit to be sent to the cmucl-commit mailing list.