Fails on macos-15-arm64: /usr/bin/rmz: Read-only file system #39
Description
This action fails on macos-latest which currently resolves to macos-15-arm64: https://github.com/haskell/hackage-server/actions/runs/17315560040/job/49157667263#step:3:97
mv: fastcopy: open() failed (to): /usr/bin/rmz: Read-only file system
Downstream issue:
CC @peterbecich