Look at using flask-caching

[briantist]

Somewhat related:

• Allow for disabling the upstream proxy cache, and/or caching locally #4

https://flask-caching.readthedocs.io/en/latest/

The current caching mechanism for upstream requests (which caches in Artifactory) is custom written. It might be better written as a custom caching backend for flask-caching instead.

By separating out the backend that way, we could also unlock the ability to use any cache backend supported, like local filesystem or whatever.

We can also look to start using this to cache other data (combined listings, etc.).