Add missing kernel config check

[zouxianyu]

Added a check for the kernel config CONFIG_IP_NF_TARGET_REJECT, as this is required to run k3s.

Proposed Changes

When I used TOPEET's rk3588 board, I found that k3s was not working with the official image. l found out that the kernel needs to enable CONFIG_IP_NF_TARGET_REJECT but check-config.sh doesn't check that.

Types of Changes

I added a config check for CONFIG_IP_NF_TARGET_REJECT to the check-config.sh script.

Verification

Here are some error messages taken from journalctl -u k3s.

master k3s[2242]: E0515 06:41:43.060036    2242 proxier.go:1525] "Failed to execute iptables-restore" err=<
master k3s[2242]:         exit status 2: iptables-restore v1.8.7 (legacy): Couldn't load target `REJECT':No such file or directory
master k3s[2242]:
master k3s[2242]:         Error occurred at line: 9
master k3s[2242]:         Try `iptables-restore -h' or 'iptables-restore --help' for more information.
master k3s[2242]:  >

Testing

With CONFIG_IP_NF_TARGET_REJECT enabled in the kernel, k3s works fine.

Linked Issues

#10099

User-Facing Change

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.61%. Comparing base (dba30ab) to head (9cdd206).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10100      +/-   ##
==========================================
- Coverage   46.55%   41.61%   -4.94%     
==========================================
  Files         173      173              
  Lines       14645    14645              
==========================================
- Hits         6818     6095     -723     
- Misses       6540     7386     +846     
+ Partials     1287     1164     -123     

Flag	Coverage Δ
e2etests	36.37% <ø> (-10.01%)	⬇️
inttests	19.80% <ø> (?)
unittests	11.38% <ø> (ø)

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