Minimize production Docker image

[daveqnet]

Is your feature request related to a specific problem?

• There are packages e.g. vim included in the current fidesctl image that are not strictly necessary for the application to function. Aside from image bloat, this is a security risk. An attacker can't exploit what isn't included (attack surface reduction).

Describe the solution you'd like

• Identify the essential packages that need to be included in a production image.
• Modify the build process to include strictly essential packages & files in the production image.

Describe alternatives you've considered, if any

n/a

Additional context

• This issue also applies to fidesops, but I haven't created a separate issue for it.
• Dev images can be bloated. Indeed, they should be optimized for build speed, not size.
• Multi-stages builds might help, but are of limited use for Python application images.
• Moving from Debian to Alpine as a base image is probably a dead end. Build durations would mushroom (alienating devs) and musl libc is problematic (no wheels).
• Some basic tips