Fix API image builds

[zackkrida]

Fixes

Fixes #2411 by @zackkrida

Description

Fixes the conflict when copying over audiowaveform dependencies from the Dockerfile by explicitly copying over subfolder contents instead of the subfolders themselves, which already exist as symlinks in the root of the base image and therefore cause an error when attempting to copy over them.

Testing Instructions

Review the code, CI should pass. After merged, the staging API should continue to work and serve thumbnails.

You can also checkout main and just recreate. Observe that the build fails. Then checkout this branch and just recreate && just up and observe that everything works.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• 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.
• I ran the DAG documentation generator (if applicable).

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[AetherUnbound]

I confirmed that the image builds locally and that it generates audio waveforms correctly!

[krysal]

Great. I'll create an issue to move this out after resolving the critical issue.

[krysal]

Wondering why this is needed here 😶

[stacimc]

Looks good, all works locally 💯