Actually fix agent certificate rotation

[brandond]

Proposed Changes

Actually fix agent certificate rotation

Got closer with #9772 but it's still broken :(

Types of Changes

bugfix

Verification

See linked issue

Testing

Linked Issues

• k3s certificate rotate fails on agents #9785

User-Facing Change

Further Comments

[brandond]

root@k3s-server-1:~# k3s certificate rotate
INFO[0000] Server detected, rotating agent and server certificates
INFO[0000] Rotating dynamic listener certificate
INFO[0000] Rotating certificates for kubelet
INFO[0000] Rotating certificates for api-server
INFO[0000] Rotating certificates for admin
INFO[0000] Rotating certificates for cloud-controller
INFO[0000] Rotating certificates for controller-manager
INFO[0000] Rotating certificates for etcd
INFO[0000] Rotating certificates for scheduler
INFO[0000] Rotating certificates for supervisor
INFO[0000] Rotating certificates for k3s-controller
INFO[0000] Rotating certificates for auth-proxy
INFO[0000] Rotating certificates for kube-proxy
INFO[0000] Successfully backed up certificates to /var/lib/rancher/k3s/server/tls-1712703646, please restart k3s server or agent to rotate certificates

root@k3s-agent-1:~# k3s certificate rotate
INFO[0000] Agent detected, rotating agent certificates
INFO[0000] Rotating certificates for kube-proxy
INFO[0000] Rotating certificates for kubelet
INFO[0000] Rotating certificates for k3s-controller
INFO[0000] Successfully backed up certificates to /var/lib/rancher/k3s/agent/tls-1712703619, please restart k3s server or agent to rotate certificates

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 43.10%. Comparing base (08f1022) to head (465d0ea).

Files	Patch %	Lines
pkg/cli/cert/cert.go	50.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9902      +/-   ##
==========================================
- Coverage   49.60%   43.10%   -6.50%     
==========================================
  Files         158      158              
  Lines       14013    14017       +4     
==========================================
- Hits         6951     6042     -909     
- Misses       5758     6835    +1077     
+ Partials     1304     1140     -164     

Flag	Coverage Δ
e2etests	35.97% <0.00%> (-10.14%)	⬇️
inttests	37.07% <50.00%> (+0.06%)	⬆️
unittests	16.56% <ø> (ø)

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