Add Makefile

[bendhouseart]

Adding a Makefile provides us with a consistent way to execute developer commands

During testing and development it's helpful to have access to linting/formatting as well as docker build and upload commands that properly tag and upload new releases of images.

• docker build
• docker push
• black */.py

Later these "local" commands can be used in CI so that local and automated testing steps are reproducible.

[mnoergaard]

Closed as completed via #24