Issue 244 - Add affinity to the linux node by default

[krol3]

This PR add a default affinity to create the pod in the linux nodes.

Related the issue-244

[codecov]

Codecov Report

Merging #289 (fb6ad9c) into main (10a7cc4) will decrease coverage by 0.34%.
The diff coverage is 15.00%.

@@            Coverage Diff             @@
##             main     #289      +/-   ##
==========================================
- Coverage   62.52%   62.18%   -0.35%     
==========================================
  Files          57       57              
  Lines        2754     2774      +20     
==========================================
+ Hits         1722     1725       +3     
- Misses        807      823      +16     
- Partials      225      226       +1     

Impacted Files	Coverage Δ
pkg/kubehunter/scanner.go	0.00% <0.00%> (ø)
pkg/starboard/config.go	68.69% <0.00%> (-8.76%)	⬇️
pkg/cmd/scan_ciskubebench.go	54.34% <25.00%> (-2.80%)	⬇️
pkg/polaris/scanner.go	87.20% <100.00%> (+0.10%)	⬆️
pkg/trivy/scanner.go	73.06% <100.00%> (+0.09%)	⬆️

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[danielpacak]

@krol3 I left a few comments. I also notices that there are failing unit tests.