Specify pull policy for openverse- images

[dhruvkb]

Description

This PR

• specifies a pull_policy of never for custom Openverse images that are meant to be built on-device
• removes the image field for services where the image name is the same as the default openverse-<service_name> (this had to be reversed because ingestion server integration tests would fail)

Effectively, these changes mean that the warning referenced in #4526 (comment) will go away. This will be further expanded by #1910 which will expand the second change to apply to more services.

This also makes it safer by ensuring that we never accidentally pull a (potentially nefarious) image named openverse-* from the Docker registry.

Testing Instructions

1. Check out this PR.
2. Remove any number of openverse-* images from Docker.
3. Run just up.
4. You should not see any warnings and the missing images should be built and tagged automatically.

Checklist

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  PRs) or the media properties generator (./ov just catalog/generate-docs media-props
  for the catalog or ./ov just api/generate-docs for the API) where applicable.

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[zackkrida]

Great! I saw these errors but not the existing issue for them; glad there's work to fix it.

[krysal]

LGTM