[Task] Dockerfile to Dofigen struct transformation

[taorepoara]

What should be done

In order to create a Dofigen configuration from a Dockerfile, implement a transformation to a Dofigen struct on the Dockerfile struct.

Technical recommendation

Implement the From or Into (I can't remember which one is to implement ^^) ?

It might be interesting to transform the structure as is in order to let the user choose to use the Dofigen optimization or not.
It might be interesting two to comment the original value with an explanation and let the user chose to uncomment it or not.

The Dockerfile layer is not managed as is in Dofigen so additional builders might be needed.

Ecological concerns

Is this task linked with any other ?

Blocked by #347