The CI builds in the pact-reference are extremely slow (sometimes over an hour). This is mainly queue time waiting for MacOS agents. It currently runs both intel and arm MacOS agents, which I think is a waste as the OS is not going to behave differently on the different architectures. I'm going to remove the intel build, and reduce the matrix a bit.

The death knell has already sounded for intel macos, and we already got round the inconsistencies with mimetypes cross platform, so this is all good from my side.