use exec method for direnv

[jdx]

There are 2 ways to get direnv to read config, either by writing to a file with source_env or calling direnv dump. I think this one (direnv dump) is a bit cleaner since we don't need to write to a file. It's just a matter of setting environment variables when calling a subprocess.

I also like that this doesn't show an extra line of output when direnv loads. This is a before/after:

source_env

❯ touch .envrc
direnv: loading ~/src/rtx/.envrc
direnv: using rtx
direnv: loading /var/folders/m0/5_ttfcld3sx4sp34bw240qbc0000gn/T/rtx/direnv/ba9cf81aecd9bc74.envrc
direnv: export +RUBYLIB ~PATH

direnv dump

❯ touch .envrc
direnv: loading ~/src/rtx/.envrc
direnv: using rtx
direnv: export +RUBYLIB ~PATH

[jdx]

Codecov Report

Base: 82.52% // Head: 83.18% // Increases project coverage by +0.66% 🎉

Coverage data is based on head (e469c95) compared to base (cfa2ca6).
Patch coverage: 96.55% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   82.52%   83.18%   +0.66%     
==========================================
  Files          67       68       +1     
  Lines        2054     2076      +22     
==========================================
+ Hits         1695     1727      +32     
+ Misses        359      349      -10     

Impacted Files	Coverage Δ
src/cli/activate.rs	100.00% <ø> (ø)
src/cli/alias/ls.rs	85.71% <ø> (ø)
src/cli/asdf.rs	65.38% <ø> (ø)
src/cli/current.rs	100.00% <ø> (ø)
src/cli/deactivate.rs	100.00% <ø> (ø)
src/cli/direnv/activate.rs	0.00% <ø> (ø)
src/cli/env.rs	100.00% <ø> (ø)
src/cli/exec.rs	74.07% <ø> (+3.70%)	⬆️
src/cli/global.rs	100.00% <ø> (ø)
src/cli/latest.rs	100.00% <ø> (ø)
... and 27 more

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