Create a container-based development environment

[mkovacina]

Development for SWEEP has been Linux-based from the inception. Though written in standard C, the build process ('make') and toolchain ('gcc') don't always play nicely in Windows. To facilitate development in a non-Linux environment, a Docker-based development environment will be created. This will also be the first step towards a container-based build process.

Acceptance Criteria

• [x] Use Alpine Linux due to small image size
• [x] SWEEP should compile nominally (there are other issues to fix, but being able to build is the first step)
• [x] git
• [x] vim
• [x] tmux

[mkovacina]

PR #5 finished the work for this by integrating in VS Code support