Setup K3s with Yubikeys & smart cards on MacOS & Linux

Highlights:

This release means you can use your 2FA / smart card with k3sup for connecting to your servers.
An example would be the Yubikey which once properly configured will cause k3sup to use the ssh-agent on MacOS or Linux to connect.

• Learn more about how k3sup can install K3s over SSH

For instructions and testing see: #312

Changelog for 0.11.0:

• PR #312 Transparently use ssh-agent on linux/darwin by @johnmccabe

Commits
fd9dfea Handle absense of SSH_AUTH_SOCK and agent errors by @johnmccabe
dfedcae Add ssh-agent with fall-through to join command. by @johnmccabe
c52c222 Transparently use ssh-agent on linux/darwin by @johnmccabe

Generated by Derek