Allow precompiled JS resources to be loaded via mirror sites

In web.china.template.yml we can load plugins through GitHub's mirror website.But pre-compiled JS assets is loaded byhttps://github.com/discourse/discourse/blob/a65e22476bc6d02a107d3fca2ae5ea9f05a9f4bc/script/assemble_ember_build.rb#L16C1-L16C62In China's network environment, it is sometimes difficult to connect to get.discourse.org.So can we allow loading precompiled JS resources through mirror sites?



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