Right now, the official image only allows us to start the web service on port ::8081:

• pgweb/Dockerfile

  Line 48 in 8413681

  ENTRYPOINT ["/usr/bin/pgweb", "--bind=0.0.0.0", "--listen=8081"]

It'd be great if that port could be defined via environment variable. If we're running a bunch of services on the same network, it's pretty easy to have a conflict between services (or even across the same instances of pgweb for different databases).