where do we put big databases?

[ctb]

e.g. sourmash and kaiju need big databases.

for static installs, presumably we can rely on having them each in a specific location that we pass into the docker container with -v.

for dynamic installs (e.g. spinning up EC2 instances) we'll have to either have a snapshot or a copy in a fast-to-download locale, and then provide mechanisms to put the databases in place before running the container.

which leads to the question: how do we specify external dependencies for each container?

and what about people with private databases? how do we specify them?

presumably this is a job for either CWL or whatever dependency tracking system we use (e.g. pydoit).