Claims to succeed even when there’s an error

In my case, I hadn’t set `packagesPath`, and so `find` errored, but the action (and ultimately the workflow) still appeared to succeed. It was only after not being able to find the candidate on Hackage that I came back to review the workflow and realize what happened.

Probably, adding some strict flags (e.g., `set -euo pipefail`) would cause any failure to propagate correctly.