how do I get ng-include directive to work with a Content Delivery Network?

Yes, you are right – the problem is with cross-domain call.
Official docs say:

By default, the template URL is restricted to the same domain and protocol as the application document. This is done by calling $sce.getTrustedResourceUrl on it. To load templates from other domains or protocols you may either whitelist them or wrap them as trusted values. Refer to Angular’s Strict Contextual Escaping.

and

Please note: The browser’s Same Origin Policy and Cross-Origin Resource Sharing (CORS) policy apply in addition to this and may further restrict whether the template is successfully loaded. This means that without the right CORS policy, loading templates from a different domain won’t work on all browsers.

Example:

angular.module('myApp', []).config(function($sceDelegateProvider) {
  $sceDelegateProvider.resourceUrlWhitelist([
    // Allow same origin resource loads.
    'self',
    // Allow loading from outer templates domain.
    'http://cdn.somewebsite.com/templates/**'
  ]); 
});

Helpful links:

So your problem may be solved by appropriate angular settings, but not for all browsers.

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