[FEATURE REQUEST] Add Mac Support

[fluttersiast]

I recreate it based on the issue #24

Run wzieba/Firebase-Distribution-Github-Action@v1
  with:
    appId: app: "MY_ID"
    token: MY_TOKEN
    groups: testers
    file: build/ios/iphoneos/app.ipa
    debug: false
##[error]Container action is only supported on Linux

It's still an issue, if you have self hosted macos runner there is only one optin via CLI installation.

Could you please add mac support as well

[kutsan]

@wzieba Sorry for pinging but it would be incredible if you could offer assistance with this.