[DRAFT][Dockerfile]Use Docker Multistage Builds

[yelghali]

In multistage build, we use intermediate images (build stages) to compile code, install dependencies, and package files in this approach. The idea behind this is to eliminate unwanted layers in the image.

After that, only the necessary app files required to run the application are copied over to another image with only the required libraries, i.e., lighter to run the application.

to learn more: https://docs.docker.com/build/building/multi-stage/

To help you make your container smallers and more optimized, you can use tools like: https://github.com/slimtoolkit/slim