fix handling of env defaults in k8s provider

[ddollar]

No description provided.

[codecov]

Codecov Report

Merging #3214 into master will decrease coverage by 0.03%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #3214      +/-   ##
==========================================
- Coverage   28.04%   28.01%   -0.04%     
==========================================
  Files         262      262              
  Lines       22375    22399      +24     
==========================================
  Hits         6276     6276              
- Misses      14916    14940      +24     
  Partials     1183     1183

Impacted Files	Coverage Δ
provider/k8s/release.go	0% <0%> (ø)	⬆️
provider/k8s/helpers.go	0% <0%> (ø)	⬆️

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