add node affinity

[njucjc]

No description provided.

[codecov-commenter]

Codecov Report

Merging #278 (3f148a5) into main (99f0e6b) will increase coverage by 0.03%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##            main    #278      +/-   ##
========================================
+ Coverage   4.82%   4.85%   +0.03%     
========================================
  Files         94      94              
  Lines       9293    9293              
========================================
+ Hits         448     451       +3     
+ Misses      8812    8809       -3     
  Partials      33      33              

Flag	Coverage Δ
unittests	4.85% <ø> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
pkg/pool/pool.go	64.35% <0.00%> (+0.99%)	⬆️

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