GAS: Limitations on Sharing and Permissions for Google Sites and Docs
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I don't see documentation on setting sites sharing and permissions with advanced options as:

 - Anyone with the link (no sign in required)
 - Public on the Web

Creating or copying a site defaults the permissions only to the script owner, and would have to manually go to the site itself to set the permissions.

Is this not in the Sites Services yet or is there a workaround?