Debug double-free

Workflow runs for Debug double-free

• Set USD_BUILD_PATH so prebuilt OpenImageIO config resolves include dir

  completed successfully:
  Debug double-free#2:Commite728c97pushedbydstover11
  stover/debug-doublefree

  Jul 17, 20263m 12s
  More actions for workflow run 2

• Add debug workflow to capture double-free backtrace on Linux

  failed:
  Debug double-free#1:Commitadb0279pushedbydstover11
  stover/debug-doublefree

  Jul 17, 20265m 47s
  More actions for workflow run 1