Investigate which tests need what filesystem permissions and where

[jackfirth]

The current docker setup has to grant the non-root testing user permission to various directories including /tmp and Racket's package and collection installation directories. I forget which tests need this.

Ideally, individual tests shouldn't need any sort of filesystem permissions and should rely on a test runner / framework to supply access to that sort of stuff, so it's easy to setup a test environment. But first there should be a list of which release tests are uncooperative with respect to the filesystem.