Add ca-cert rotation integration test, and fix ca-cert rotation

[brandond]

Proposed Changes

Add ca-cert rotation integration test, and fix ca-cert rotation

Types of Changes

bugfix, testing

Verification

See linked issue

Testing

Rotate self-signed or custom CA certs and restart K3s. You should see the following message in the log before restarting, and K3s should restart successfully.

Oct 08 22:49:11 systemd-node-1 k3s[539]: time="2024-10-08T22:49:11Z" level=info msg="Using current data for PasswdFile: /var/lib/rancher/k3s/server/cred/passwd"
Oct 08 22:49:11 systemd-node-1 k3s[539]: time="2024-10-08T22:49:11Z" level=info msg="Using current data for IPSECKey: /var/lib/rancher/k3s/server/cred/ipsec.psk"
Oct 08 22:49:11 systemd-node-1 k3s[539]: time="2024-10-08T22:49:11Z" level=info msg="Using current data for EncryptionConfig: "
Oct 08 22:49:11 systemd-node-1 k3s[539]: time="2024-10-08T22:49:11Z" level=info msg="Using current data for EncryptionHash: "
Oct 08 22:49:11 systemd-node-1 k3s[539]: time="2024-10-08T22:49:11Z" level=info msg="Saving cluster bootstrap data to datastore"
Oct 08 22:49:11 systemd-node-1 k3s[539]: time="2024-10-08T22:49:11Z" level=info msg="certificate: Cluster Certificate Authority data has been updated, k3s must be restarted."

Linked Issues

• K3s fails to start after running k3s certificate rotate-ca #11014

User-Facing Change

Further Comments

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

Project coverage is 43.97%. Comparing base (e9c5295) to head (eb330ee).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/server/cert.go	0.00%	14 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (e9c5295) and HEAD (eb330ee). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (e9c5295)	HEAD (eb330ee)
e2etests	7	6

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11013      +/-   ##
==========================================
- Coverage   49.82%   43.97%   -5.86%     
==========================================
  Files         178      178              
  Lines       14814    14816       +2     
==========================================
- Hits         7381     6515     -866     
- Misses       6086     7097    +1011     
+ Partials     1347     1204     -143     

Flag	Coverage Δ
e2etests	36.21% <0.00%> (-9.83%)	⬇️
inttests	36.78% <0.00%> (+0.12%)	⬆️
unittests	13.52% <0.00%> (-0.01%)	⬇️

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