[DevEx] allow for hot reload of backend and auth

[sabineschaller]

Context

We currently have to build the backend and auth docker containers in order to check whether a feature we are working on is complete. @JoblersTune is already working on implementing a hot reload for the frontend by mounting the source files into the docker container and using the remix dev command to run it inside the docker container if the node-env is development. We would like to have similar functionality for backend and auth.

EDIT: I guess we could even extend that to the MASE.

Todos

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