General Dockerfile improvements

[AetherUnbound]

Current Situation

As it stands, our Dockerfile(s) are fairly typical. There are a few steps we could take to improve/optimize the image(s).

Suggested Improvement

• Use PIPNOCACHEDIR¹
• Only mount test files when testing
• Replace ADD with COPY ²
• Only perform db init/users create when requested, otherwise use db upgrade

Benefit

This will slim down the image, ensure that we're using best practices, and reduce redundant startup executions.

Alternatives

Additional context

Implementation

• 🙋 I would be interested in implementing this feature.

Footnotes

1. https://stackoverflow.com/a/45594808/3277713 ↩

2. https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#add-or-copy ↩