Mounting the entire root source directory is bad practice

[eladavron]

Docker containers should contain as little content as possible, and when possible - not be live.
Using:

volumes:
  - .:/app

Both loads the container with a lot of unnecessary files AND makes it "live", meaning that any changes in the source code automatically get applied inside the container, which is an antipattern. Containers should be self-sustaining and isolated.
Mounting source code like this should only be done for debugging.

A few required corrections:

• In the Dockerfiles, use the COPY or ADD directives to copy the necessary files to the container image, as selectively as possible.
• Maintain a seperate docker-compose.yaml file for debugging and for production, with only the debugging one containing the mounting.
• The style container might also be redundant in such a case - just compile SASS once and avoid having to use watch (since again, that is for live debugging)