feat: Use default vault environment variables

[werne2j]

Description

Support all vault env vars instead of specific ones

Fixes: #85

Checklist

Please make sure that your PR fulfills the following requirements:

• Reviewed the guidelines for contributing to this repository
• The commit message follows the Conventional Commits Guidelines.
• Tests for the changes have been updated
• Docs have been added / updated

Type of Change

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• New tests
• Build/CI related changes
• Documentation content changes
• Other (please describe)

[codecov]

Codecov Report

Merging #94 (fb6bdf0) into next (c7910af) will decrease coverage by 1.83%.
The diff coverage is 61.29%.

@@            Coverage Diff             @@
##             next      #94      +/-   ##
==========================================
- Coverage   54.46%   52.62%   -1.84%     
==========================================
  Files          15       15              
  Lines         538      534       -4     
==========================================
- Hits          293      281      -12     
- Misses        199      207       +8     
  Partials       46       46              

Impacted Files	Coverage Δ
cmd/util.go	65.51% <ø> (+20.06%)	⬆️
pkg/config/config.go	61.03% <59.32%> (-29.59%)	⬇️
cmd/generate.go	68.88% <100.00%> (+2.93%)	⬆️

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[jkayani]

Looks good