remove orphaned php container

[ionous]

at some point we should manually run docker-compose up --remove-orphans to quiet this warning:
Found orphan containers (shift_php_1) for this project. If you removed or renamed this service in your compose file, you can run this command with the --remove-orphans flag to clean it up.

[fool]

After reading the docs I don't think it will be a problem, but I also wouldn't know how to recreate the broken image/container, in case it somehow broke prod based on some unexpected dependency on it - yes, an unlikely stretch but not the kind of emergency surgery I want to sign up for.

We might obviate this by just starting from scratch as we plan to do in #707 / #772