Proposal: create a docker container for InVEST

[phargogh]

I propose we create a docker distribution for InVEST, as discussed in the software coffee call 2022-11-11.

There are a couple of use cases here that came up in conversation:

• The Recreation server would benefit from having a docker container
• There's been some evidence of demand for this over the years, including in our own work on the urban online project.

A few specific thoughts about the container:

• The default entrypoint would be the InVEST CLI
• We'd store the container on the github registry
• The container build and probably some kind of primitive test like whether we can import natcap.invest would be part of our github actions
• We would only push a new container to GHCR when there's a new build on main.
• Containers would be tagged with the InVEST version for easier referencing.

We talked about this on the software team call mentioned above, with a thumbs-up (no design doc needed) from all.

[phargogh]

Working on this in feature/1115-create-docker-container-for-InVEST in my fork.