Feature: Dockerfile Organization & Enhancements

[stumpylog]

Proposed change

This PR accomplishes a few improvements to our Dockerfile, with no functional changes and at least a few MBs of image size shaved off.

First, the Dockerfile is now roughly ordered in order from least changing (jbig2enc) to most changing (back and front ends). Anytime a layer changes, following layers must re-run, so this ordering helps reduce the churn a bit.

Although with the registry caching the build is pretty quick, when there is a change to requirements.txt (so every Monday), all the runtime packages are also re-installed. This change de-couples the Python requirements from the system requirements.

Finally, the buildkit syntax has support for a RUN command which can mount either local or image file systems into the build. This means instead of copying the library of installers, they can be mounted, run and unmounted, instead of being left taking up space in the final image.

There should be zero functional changes. I've successfuly loaded documents, run management commands and accessed the webui without issue.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please explain)

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[qcasey]

This is sensible, and still builds+consumes locally for me.

[shamoon]

Yea looks good (not that I can pretend to understand 100% of it but it works for me too)!

Appreciate your constant improvements! Also an auspicious PR number 👍

[github-actions]

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