Moved packed-mn arm64 MacOS build from Cirrus CI to GHA

[maxirmx]

• Moved packed-mn arm64 MacOS build from Cirrus CI to GHA
• Created metanorma-darwin-arm64 release artifact

Metanorma PR checklist

• Breaking changes (list related PRs)
• Documentation update required (create task for this)
• External dependency introduced (documentation update need)
• Gem with native library introduced

[maxirmx]

Now GHA has macos arm64 runner so I suggest to build metanorma arm64 package and publish arm64 binary
If this binary is used it will resolve the issue observed in this run: https://github.com/metanorma/mn-samples-iso/actions/runs/8827676491/job/24236088982?pr=104

[ronaldtse]

Now GHA has macos arm64 runner so I suggest to build metanorma arm64 package and publish arm64 binary If this binary is used it will resolve the issue observed in this run: https://github.com/metanorma/mn-samples-iso/actions/runs/8827676491/job/24236088982?pr=104

Fully agree. Thank you @maxirmx !