minimal docker build considerations

[mwdchang]

We can further remove packages and installs to slim down the image size for askem-beaker, maybe in a Dockerfile.minimal kind of setup.

Things we do not need:

• We should be able to remove R related packages: r-base r-cran-irkerne, as we re not supporting R-language currently
• We should be able to remove gdal related packages, these are geospatial related things
• We can probably remove rust langague

Things we probably do not need

• PySB, I don't really know what this is, it seems to be realized as a beaker-context which we are not using
• We probably do not need the chroma_db chirho stuff, as we don't allow modellers to directly code against pyciemss
• Likewise, we don't think we need to include pyciemss as we run through "pyciemss-service" instead of beaker

[YohannParis]

@mattprintz could you weight on this please?
We are looking to put Terarium on a "cheap to run" mode during the demo + search for transition phase.

[mattprintz]

I agree that all of those things can be removed. The possible exception is that Rust was a requirement for one of the python packages, and if you still need that package, you might still need Rust.

I can't remember which package it was though and if it's still needed