hof/fmt: csharpier builds are increasingly flakey in GHA

[verdverm]

Not sure the root cause, the error is a seg fault during dotnet restore/publish. Multi-arch images may be the instigation

Links:

• https://forums.docker.com/t/dotnet-restore-never-completes-on-m1-mac-when-targeting-linux-amd64-platform/132337/14