Add tests, coverage and CI

[jtblin]

• Coverage
• CI
• Tests for k8s package
• Tests for iam package
• Tests for iptables package
• Tests for mappings package
• Tests for cmd package

[rickard-von-essen-iz]

It would be great with automated builds.

[jtblin]

Unfortunately, it cannot be done retroactively once you've started to push to a repo and not compatible with the way I build the image. What is it that you're missing from https://hub.docker.com/r/jtblin/kube2iam/? I'm pushing images on every release anyway.

[rickard-von-essen-iz]

Because of trust. Automated builds "guarantees" that the content of the container corresponds to the source.