fix: Ensure role label on nodes

[sagiru]

it is generally more pleasant to set these roles.

Proposed Changes

Ensure the node role is configured as expected instead of beeing none.

(.venv) sascha@apu:~/git/dmix/ansible-infra$ k get nodes
NAME        STATUS   ROLES                       AGE   VERSION
...
intkwkr01   Ready    worker                      19d   v1.24.12+k3s1
intkwkr02   Ready    none                     19d   v1.24.12+k3s1

Checklist

• Tested locally
• Ran site.yml playbook
• Ran reset.yml playbook
• Did not add any unnecessary changes
• Ran pre-commit install at least once before committing
• 🚀

[sagiru]

sascha@apu:~/.../k3s-ansible$ ansible-lint roles/k3s/post/tasks/main.yml 
WARNING: PATH altered to expand ~ in it. Read https://stackoverflow.com/a/44704799/99834 and correct your system configuration.

Passed with production profile: 0 failure(s), 0 warning(s) on 2 files.

[timothystewart6]

Looks like there are merge conflicts now, would love to merge this in at some point!

[timothystewart6]

We should probably go this route instead #339 Also, closing due to conflicts.