Use the toolbelt image for linting and building code

[javorszky]

In order to remove dependencies from the host machine and leave with only docker, there's a docker image available called toolbelt here: https://github.com/suborbital/toolbelt

The aim of this issue is to replace all the make targets that lint, fix, and build sat so they all go through this image rather than running binaries that we need to install on the host computer.