Why does RHEL image builder fails with error: failed to exec scriptlet interpreter /bin/sh: Permission denied

Issue

• RHEL Image builder fails to build an image with a simple test blueprint.

  # composer-cli blueprints show test-blueprint
  name = "test-blueprint"
  description = "test-blueprint"
  version = "0.0.1"
  modules = []
  groups = []
  distro = ""
  
  [[packages]]
  name = "tmux"
  version = "*"
  
  [customizations]
  
  [[customizations.user]]
  name = "root"
  password = "<redacted>"
  

• The errors generated in the journal logs show the following for osbuild-worker unit failed with Permission Denied below

  <...output skipped...>
  level=info msg="    diffutils-3.6-6.el8.x86_64" jobId=edd20b64-f6b4-41f4-b30e-a3f86f5c8a99
  level=info msg="    error: failed to exec scriptlet interpreter /bin/sh: Permission denied" jobId=edd20b64-f6b4-41f4-b30e-a3f86f5c8a99
  level=info msg="    warning: %post(diffutils-3.6-6.el8.x86_64) scriptlet failed, exit status 127" jobId=edd20b64-f6b4-41f4-b30e-a3f86f5c8a99
  level=info msg="    findutils-1:4.6.0-21.el8.x86_64" jobId=edd20b64-f6b4-41f4-b30e-a3f86f5c8a99
  level=info msg="    error: failed to exec scriptlet interpreter /bin/sh: Permission denied" jobId=edd20b64-f6b4-41f4-b30e-a3f86f5c8a99
  level=info msg="    warning: %post(findutils-1:4.6.0-21.el8.x86_64) scriptlet failed, exit status 127" jobId=edd20b64-f6b4-41f4-b30e-a3f86f5c8a99
  level=info msg="    libgomp-8.5.0-20.el8.x86_64" jobId=edd20b64-f6b4-41f4-b30e-a3f86f5c8a99
  level=info msg="    error: failed to exec scriptlet interpreter /bin/sh: Permission denied" jobId=edd20b64-f6b4-41f4-b30e-a3f86f5c8a99
  level=info msg="    warning: %post(libgomp-8.5.0-20.el8.x86_64) scriptlet failed, exit status 127" jobId=edd20b64-f6b4-41f4-b30e-a3f86f5c8a99
  level=info msg="    libgpg-error-1.31-1.el8.x86_64" jobId=edd20b64-f6b4-41f4-b30e-a3f86f5c8a99
  level=info msg="    libgcrypt-1.8.5-7.el8_6.x86_64" jobId=edd20b64-f6b4-41f4-b30e-a3f86f5c8a99
  level=info msg="    error: failed to exec scriptlet interpreter /sbin/ldconfig: Permission denied" jobId=edd20b64-f6b4-41f4-b30e-a3f86f5c8a99
  <...output skipped...>