HNC: Add support for plugin build for darwin amd64

[tcnksm]

Related issue: #1029

This PR adds support for building and uploading the plugin for the darwin (Mac) environment. I just follow the current way which is done by Linux build. This changes binary name of release so we need to update the guide as well. If the current way is ok then let me update the guide as well.

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[adrianludwin]

/ok-to-test
/lgtm
/approve

Thanks for this change! I'll also try to backport it to 0.5.2 (which I think we'll release to fix the object webhook issue - likely next week).

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adrianludwin, tcnksm

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