Thanks @revant_one - that’s really helpful.
I hadn’t got the rebuild of apps.txt line in my docker-compose - I guess I must have made mine more than 4 months ago!
Will it do any harm to rerun the build container on every restart? Or do I have to take it out of the docker-compose, or put some test in it so it does nothing for an existing site?
Any offers of wisdom on this question? How to restore a backup from one site name to another - #5 by nikkilocke