Add a dockerfile for simpler environment management

[louismerlin]

The goal of this PR is to replace the venv setup by a docker setup to be able to run retrowrite on many environments with minimal setup.

I have only tested the new environment with the demos/user_demo, and also created a one-line script to build cftool.

Still TODO :

• [x] Write some info and a tutorial in the README
• [ ] Test the new environment against more complex usecases (kernel for example)

[cyanpencil]

The docker for buidling cftool is especially nice, thanks!

[diagprov]

Question on this now I'm looking at it - do we need the capstone submodule? I can't remember if we build it ourselves or if that is my other project...

[louismerlin]

From what I could gather, it was added as a third party module to make sure the latest version was used, even with an older OS. Docker removes this problem, so I deleted the third party module. I could be wrong, but that was how it was stated in the documentation.

[cyanpencil]

So I gave another look at this and I have the following comments:

• deleting the third party module is the right call, we're not interested in compiling capstone from scratch. Btw, whenever we have a call together don't remind me about it or I'll spend 20 minutes on a huge rant on capstone
• Can you remove the references to setup.sh in the README in the kretrowrite section, since setup.sh is being bombed?
• I don't see any references to make build in the readme, you should either add that or add build as a dependency to make shell in the Makefile (but I'm not sure how easy that is)
• It might be a stupid question, but are we sure that the Dockerfile works on arm? I never tried docker on arm. From a quick look it says that python:3.9.2-slim is offered for aarch64 too on dockerhub so it might work without any changes, what do you think? If I have time I'll try to test it
• imho skip the kernel testing, you will lose a ton of time and I don't see any changes that would break kernel support. Just make sure that cftool is being built and works

Sorry for the late review ^^

[louismerlin]

@cyanpencil commits 4a7ed1f and 68da347 address your concerns.

@diagprov maybe we can discuss trying out this branch on arm on Wednesday ?

[cyanpencil]

Thanks a lot! Looks good to me now :)

[diagprov]

Gonna close this, I think we functionally merged it, and now the tool is public anyway we can continue development there. 2x issue trackers is a mess :)