Hi Ed
There are two separate issues here. I'll address the first one here and the 2nd one I'll address in Issue with changelog 53. Upgrade Redis
It looks like the issues was with commcare-cloud getting the deploy diff URL. I suspect there is something wrong with the current release. If you run git rev-parse HEAD in the current release I think you'll get the same error.
I think this happens when the files in the git repo have mixed ownership. You could try run:
/home/cchq/monolith/releases $ chown -R cchq *