added RTX_* env vars for plugin interface

[jdxcode]

No description provided.

[codecov]

Codecov Report

Patch coverage: 94.44% and project coverage change: -0.01 ⚠️

Comparison is base (4165acd) 88.99% compared to head (eb04f65) 88.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #262      +/-   ##
==========================================
- Coverage   88.99%   88.99%   -0.01%     
==========================================
  Files          99       99              
  Lines        7536     7551      +15     
==========================================
+ Hits         6707     6720      +13     
- Misses        829      831       +2     

Impacted Files	Coverage Δ
src/runtimes.rs	88.12% <93.75%> (+0.58%)	⬆️
src/toolset/mod.rs	79.35% <100.00%> (+0.13%)	⬆️
src/plugins/mod.rs	86.48% <0.00%> (-0.55%)	⬇️
src/cli/where.rs	98.48% <0.00%> (ø)

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