Dockerize the backend

[iFialAtFail]

Dockerize the backend. Create a dockerFile that can build the image, then create and push the image to a docker container repository such as https://hub.docker.com/

Test by adding the container to the docker-compose.yaml (temporarily) and making sure it all works together. If so, add a copy of that docker-compose.yaml to the frontend repository so they can easily use it for testing the front end against