update k3s sysext example

[kranurag7]

• with overwrite set to true, butane was complaining and I was not able to transpile the same config to JSON.
• This also updates the user and group of kubeconfig (/etc/rancher/k3s/k3s.yaml) so that we don't have to use sudo with kubectl commands.

[tormath1]

Thanks. While at here, can you fix this example too:

sysext-bakery/README.md

Line 310 in e3534d3

links:

?

It should be like this:

variant: flatcar
version: 1.0.0
storage:
  files:
    # filename needs to be k3s.raw
    - path: /etc/extensions/k3s.raw
      contents:
        source: https://github.com/flatcar/sysext-bakery/releases/download/latest/k3s-v1.29.2+k3s1-x86-64.raw
  links:
    - path: /etc/systemd/system/multi-user.target.wants/k3s-agent.service
      target: /usr/local/lib/systemd/system/k3s-agent.service
      overwrite: true

[tormath1]

Hello @kranurag7 would you be interested to continue on this PR? It will close this issue: #80

[kranurag7]

Hello @kranurag7 would you be interested to continue on this PR? It will close this issue: #80

Completely missed this among noisy GitHub notifications [sorry about that :( ]
I've addressed the comments via kranurag7@a853e69

[tormath1]

@kranurag7 thanks a lot for fixing this!