The reasoning of this is because port 5000 is, by default, used by
an AirPlay receiver process on Macs. While this can be turned off,
we'd like this app to work without needing to adjust default
configurations on a machine.
There was inconsistency in the worker compose yaml for depends_on. The worker requires both db and redis, and in the default docker-compose.yml it was missing db, causing worker to crash on `docker-compose up`. In two other compose files for stacks, where depends_on was used for other services, I added it for the worker to match.
