See the ubuntu build, which fails because the binary file that should exist at sdist-test/.stack-work/install/x86_64-linux/0c876ca1dfc6728d04f0d922e905e8ecaa12cec66470d064293c7f7c2a261f0b/8.10.4/bin/purs does not exist.

It seems #4072 caused an issue by introducing the --hadock flag.