Add "join" command to form a complete cluster
Add join command The join command installs the agent software on a remote host after having fetched the node-token from a k3s server specified via the --server-ip flag. Tested with 2x Ubuntu 18.04 machines on Civo Cloud using the root user for ssh. Closes: #3 Signed-off-by: Alex Ellis (OpenFaaS Ltd) <[email protected]>