feat: make exportBuildArtifact compliant with sh

[paulbalaji]

should fix https://github.com/hyperlane-xyz/hyperlane-monorepo/actions/runs/8257193993/job/22592571029#step:5:25

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Latest commit: e69d664

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[codecov]

Codecov Report

Merging #3412 (e69d664) into main (f9d67aa) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3412   +/-   ##
=======================================
  Coverage   68.02%   68.02%           
=======================================
  Files          99       99           
  Lines        1032     1032           
  Branches      107      107           
=======================================
  Hits          702      702           
  Misses        284      284           
  Partials       46       46           

Components	Coverage Δ
core	56.25% <ø> (ø)
hooks	68.79% <ø> (ø)
isms	65.94% <ø> (ø)
token	58.41% <ø> (ø)
middlewares	80.18% <ø> (ø)