[Feat] (apps/api) Optimize Docker Images

[Sanix-Darker]

Problem Description
I think there is some paths to optimize the size of our docker images in this repo

Proposed Feature

• For apps/api/Dockerfile, i succeeded to low down the image (0.45G).

Implementation Suggestions

• Cleaning the cache
• Using the node.20-slim as prod-image instead of the base image (however i don't know if there was a purpose of setting it to in the first place base ? Maybe for debugging ?)

For more details, you can check this draft : #355

[rafaelsideguide]

@Sanix-Darker feel free to assign me for reviewing when it's done!

[Sanix-Darker]

Sure @rafaelsideguide