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Does anyone know how to have Prefect running locally in Docker, and then build a flow with a custom Dockerfile? Would that involve a container (the flow) running inside another container (Prefect)?

Actually I think I fundamentally misunderstood. Perfect running in Docker is distinct from deploying an image and then running it in a Docker worker. 

The real subtlety was specifying the `networks` param in the `Work Pool`. If you need to connect to other Docker services running locally, you _must_ specify a `network` in your `Work Pool` :
1. In the UI, go to your Work Pool
2. Click the three dots and go to `Edit`
3. On the config page, scroll down to `Networks`
4. Add the name(s) of your Docker networks in quotes, in a bracketed list, e.g. `["my-docker-network", "my-other-network"]`
5. Click `Save` at the bottom! 