refactor: use k8score.PullPolicy type for image pull policy type in spec

[KevFan]

• Minor refactor to use k8score.PullPolicy as the type instead of string for ImagePullPolicy

[codecov-commenter]

Codecov Report

Merging #148 (eceb8d1) into main (ca8cb94) will not change coverage. Report is 2 commits behind head on main. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #148   +/-   ##
=======================================
  Coverage   62.85%   62.85%           
=======================================
  Files           1        1           
  Lines         735      735           
=======================================
  Hits          462      462           
  Misses        222      222           
  Partials       51       51           

Flag	Coverage Δ
unit	62.85% <ø> (ø)

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