Cache CI/CD Install Artifacts

Title of ticket: Cache CI/CD Install Artifacts

#### Description
If we cache the stable parts of CI/CD builds, like install artifacts, we can make builds faster as well as use less resources. By caching we avoid re-doing certain steps over and over that don't really change.

This will result in quicker builds for devs, quicker deploys, and less minutes used up in GitHub Actions.

https://github.com/actions/cache/blob/main/examples.md#python---pip

#### Dependencies
None

#### DOD
- [ ] Python pip artifacts cached
- [ ]