Fix docker file

[abueide]

Didn't understand what the original docker file was doing and couldn't get it to work, so I just made my own simplified version using ubuntu. Just making a pull request in case its useful, if not feel free to just close.

[SebMoore]

Look this is good, but let me try to explain what the original dockerfile was doing and why.
The original file uses Alpine Linux: this is a linux distro that is highly desirable for Docker images because it is fifty times smaller than the Ubuntu Docker image (it's only 4MB - crazy right?). The lines referring to "apk" are just installing packages - apk is alpine's package system (like apt for ubuntu/debian). The reason (I think) there is so many more of them is that Ubuntu has a bunch of packages installed by default, and packages like build-essential actually install many dependency packages. Thing is, only some of those dependencies are actually required - like g++. Hence, the dockerfile just chooses to install the bare minimum amount of packages to avoid becoming bloated.
Yes, if it doesn't work for you then that's a more serious problem - but I don't think the right approach is to move the whole thing to Ubuntu. I unfortunately don't have docker installed so I can't workshop any solutions to your problem, but yeah - if your dockerfile works then it works, and I appreciate you sharing it, but unfortunately I don't think it's the right approach.

[madMAx43v3r]

maybe a second Dockerfile then?

[SebMoore]

maybe a second Dockerfile then?

that sounds like a good idea