Dockerfile enhancements

[obeone]

Hi,

I propose some enhancement in your Dockerfile :

• Using latest options in Dockerfile to speedup (caching) and to have something easier to read (here-doc)
• Build the whole project in docker. By using multistage build, it doesn't change the final container size
• Make code more robust with better error handling (When using ";" to separate multiple commands, if one failed, it will not stop the execution)
• Updating base system (debian) on build

[ShreyasZare]

Thanks for the PR. Its good to build docker image directly from source. But since breaks my local build process so cannot accept it.