Reduce docker image size.

[demeringo]

Problem

There may be room to optimize the size of the docker image (around 650 MB at the moment)

Solution

See if we can optimize the resulting image either by:

• using a lighter base image
• double checking waht we embark in the resulting image

Alternatives

Additional context or elements

• We can use 'dive' to inspect an image https://github.com/wagoodman/dive
• We should double check that the generated image works fine / maybe add a test in CI (as we add some strange dependency issues that only manifested with specific images in the past docker image fails to start #320 )

[jonperron]

@demeringo have any of you thought about making a multi-stage build https://docs.docker.com/build/building/multi-stage/ ?

Edit: it seems that it is the case https://github.com/Boavizta/boaviztapi/blob/main/Dockerfile#L21C1-L22C40

This is often a good way to reduce the image size, as well as building a lightweight os such as alpine ? Also, I see no .dockerignore file, is it expected ?

I can take a look into it, I'm used to create light containers.