Set API Dockerfile run to production config

[sarayourfriend]

Fixes

Fixes #2785 by @sarayourfriend

Description

Switches the API image to have gunicorn as the run command, rather than the development command. See the issue for rationale. The development run command is now just in the docker-compose file, which is the primary place for development configuration.

Testing Instructions

Run just down && just build web && just api/up and confirm that the API is accessible. Remember to just api/init if you're working on a fresh clone.

To test the production configuration, comment out the command on the web service of docker-compose.yml and confirm that it's still accessible. Note that static files will not work in this configuration because in production we rely on Nginx to serve them and we do not have that configured locally! As long as you can access the API and see unstyled DRF pages when making requests, things should be working as expected.

Checklist

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• [N/A] I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• [N/A] I ran the DAG documentation generator (if applicable).

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[stacimc]

LGTM!

[openverse-bot]

Based on the high urgency of this PR, the following reviewers are being gently reminded to review this PR:

@dhruvkb
This reminder is being automatically generated due to the urgency configuration.

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[AetherUnbound]

Built and tested locally, works great!