Add a k3s sample image

[luxas]

cc @alexellis :)

[alexellis]

This sounds awesome 😄

[chanwit]

Current version of k3s is now v0.8.1: https://github.com/rancher/k3s/releases/tag/v0.8.1

[EmeraldShift]

Hi! @doracgp and I are students at the University of Texas at Austin, and we are interested in virtualization and containerization. We'd like to tackle this issue. Can it be assigned to us?

To be sure, what does this issue entail, beyond adding a functional k3s image to images/? @chanwit

[stealthybox]

@EmeraldShift just the new image + some edits to the Makefile should be perfect. If you'd like to update or author some related documentation, that could be a beneficial second step.

Feel free to take this one! It'd be a great addition :+1:

[stealthybox]

Feel free to join our dev call on Mondays if you need help :)

[EmeraldShift]

This issue can be closed, as #739 resolves this.