fix: TTY being GC'd before command is ran

[kylecarbs]

https://github.com/coder/coder/runs/5467495938?check_suite_focus=true

[codecov]

Codecov Report

Merging #412 (c97328a) into main (d37df89) will increase coverage by 0.30%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #412      +/-   ##
==========================================
+ Coverage   68.23%   68.54%   +0.30%     
==========================================
  Files         158      155       -3     
  Lines        9225     9052     -173     
  Branches       73       73              
==========================================
- Hits         6295     6205      -90     
+ Misses       2307     2249      -58     
+ Partials      623      598      -25     

Flag	Coverage Δ
unittest-go-macos-latest	62.81% <100.00%> (+0.18%)	⬆️
unittest-go-ubuntu-latest	67.60% <100.00%> (+0.19%)	⬆️
unittest-go-windows-2022	?
unittest-js	66.02% <ø> (ø)

Impacted Files	Coverage Δ
pty/start_other.go	75.86% <100.00%> (+7.68%)	⬆️
pty/ptytest/ptytest.go	94.44% <0.00%> (-5.56%)	⬇️
provisionerd/provisionerd.go	78.30% <0.00%> (-0.56%)	⬇️
pty/pty_windows.go
agent/usershell/usershell_windows.go
pty/start_windows.go
peer/conn.go	79.79% <0.00%> (+1.02%)	⬆️
coderd/provisionerdaemons.go	59.23% <0.00%> (+1.08%)	⬆️
database/pubsub.go	77.08% <0.00%> (+2.08%)	⬆️
peerbroker/dial.go	82.45% <0.00%> (+7.01%)	⬆️
... and 2 more

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[bryphe-coder]

Nice find 👍

[kylecarbs]

It's a craaaazy race