Build failure on macos-latest stack.yaml

[winitzki]

The current project fails to build in Github CI for MacOS but succeeds for all other OSes.

See #2586 where there are no changes (other than renaming a dummy type variable).

[winitzki]

In my view, the root cause is that dhall-haskell cannot build under macos-arm64 due to some dependency problems in hnix-store and/or elsewhere. (When building hnix-store, libsodium of x86 architecture is used instead of arm64. This appears to be a misconfiguration in hnix-store.)

The macos-arm64 build was actually never tested in dhall-haskell, and in fact there were never any macos-arm64 executables released for dhall. When github changed the macos-latest runners to arm64, all builds started failing.

To resolve this issue, I propose the following path forward:

1. Use macos-13 instead of macos-latest (as in this PR). Change the repo settings so that macos-latest is no longer a requirement for passing the CI builds. (I don't have permissions to do this.) Mention in the README that macos-arm64 is currently unsupported.
2. Fix the dependency problems so that macos-arm64 build becomes successful. Enable macos-13 and macos-latest builds and publish both dhall-darwin-x86 and dhall-darwin-arm64 executables. Mention in the README that macos-arm64 is now supported.

[winitzki]

Build failure was resolved with upgrade to haskell github action version 2.7.

[winitzki]

Closing, as the builds are now passing in PRs.