An upstream library has downgraded (libcerf 2.0 -> 1.14). Homebrew has followed. On a stand-alone Mac, the command
brew install libcerf correctly installs v1.14. However, the same command in a
.github/workflows/...macos.yml script still results in v2.0 being installed.
Where could this weird behavior come from, how to override it?
Debugging is made difficult by commands like
brew show libcerf writing no output whatsoever to the GitHub Actions log.