helm docs: add extra env vars

[johnnyaug]

No description provided.

[codecov-io]

Codecov Report

Merging #937 (64ddbbb) into master (99b0c86) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #937      +/-   ##
==========================================
- Coverage   44.21%   44.17%   -0.04%     
==========================================
  Files         143      143              
  Lines       11451    11451              
==========================================
- Hits         5063     5059       -4     
- Misses       5769     5771       +2     
- Partials      619      621       +2     

Impacted Files	Coverage Δ
catalog/cataloger_create_entry.go	94.73% <0.00%> (-5.27%)	⬇️
catalog/cataloger_create_repository.go	62.96% <0.00%> (-3.71%)	⬇️

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