fix: R kernel environment variables fix

[renan-r-santos]

Fixes #15

[codecov]

Codecov Report

Attention: Patch coverage is 7.69231% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 59.75%. Comparing base (667aa52) to head (ca8d6a1).

❗ Current head ca8d6a1 differs from pull request most recent head 6423648. Consider uploading reports for the commit 6423648 to get more accurate results

Files	Patch %	Lines
src/pixi_kernel/provisioner.py	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
- Coverage   62.82%   59.75%   -3.07%     
==========================================
  Files           3        3              
  Lines          78       82       +4     
  Branches       12       12              
==========================================
  Hits           49       49              
- Misses         26       30       +4     
  Partials        3        3              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.