unexpected character "-" in variable name near...

[Josh Fletcher]

Describe the bug
If you have more than one package in NUXEO_PACKAGES you may get the error unexpected character "-" in variable name near...

To Reproduce
Steps to reproduce the behavior:
Add more than one Nuxeo Package to NUXEO_PACKAGES in .env

This is apparently because of a breaking change in Docker, see for example:

laradock/laradock#3076
tiangolo/full-stack-fastapi-template#427

The solution appears to be to add quotes around the values assigned to variables.