Bringing up Node-RED and mosquitto under "docker compose" on a Raspberry Pi

Progress, actually quite a lot of it: The problem, neatly stated. Docker is good for bringing up single services ("microservices"), but sometimes your application needs more than one thing running for the whole thing to work. Enter "docker compose", formerly "fig", which automates the process of running various Docker commands in the right order with the right arguments all driven from a configuration file. As described by their documentation: Compose is a tool for defining and running complex applications with Docker. »