get builds working for macos on arm64 and x86 about sqlite-jsoncons

[phrrngtn]

Get this arch change working with the presets

xref https://stackoverflow.com/a/69808412

m2mini:sqlite-jsoncons phrrngtn$ file builds/foo/Debug/libsqlite_jsoncons.so  builds/bar/Debug/libsqlite_jsoncons.so
builds/foo/Debug/libsqlite_jsoncons.so: Mach-O 64-bit bundle arm64
builds/bar/Debug/libsqlite_jsoncons.so: Mach-O 64-bit bundle x86_64

[phrrngtn]

self-hosted runner

https://github.com/phrrngtn/sqlite-jsoncons/settings/actions/runners/new?arch=arm64&os=osx

[phrrngtn]

figure out how to combine github runs-on and self-hosted for matrix. Want to use self-hosted for certain OS and arch combinations (e.g. self-hosted for just macOS and ARM64). I am not sure how to combine these at the moment.