[Contribution] Docker support

[darrensapalo]

Built a support tool to run Pyrseas in Docker, so that you don't have to set up a Python environment to run it.

https://github.com/darrensapalo/dbtoyaml

[jmafc]

Thank you, Darren. I guess we'll need to update our docs to show this alternative.

[xclayl]

This is a great idea. Thanks for setting this up.