Minimimum applications for docker

This repo contains just minimum applications that either:

• Runs and exits successfully (exit code 0)
• Prints "Goodbye!" and exits successfully (exit code 0)

Why ?

There are few edge use cases that require to have simple a docker image:

• Since docker-compose version 3 it is not possible to define a network without a service.
• You want to override some services⁠.