Louis, the cache control on Page Packs has nothing to do with whether a Skuid Page is visible in a public Lightning Community. Page Packs have no effect on how Skuid works at runtime — they are purely a vehicle for moving Skuid Pages between different Salesforce Orgs, e.g. between Sandbox and Prod. 

If you want a Skuid Page to be visible in a public Lightning Community or a public Force.com Site, you need to go to the Skuid Page Composer for that Page, click “Share”, and then add “Read-Only” access to the page for the Salesforce User(s) associated with the public Lightning Community/Force.com Site. Also you will need to ensure that these Public Site User(s) have the “Skuid Page Viewer” Permission Set assigned / or have the corresponding permissions on their Profile.

Ah, so sorry Zach - I meant Support File rather than Page Pack - I get those mixed up. We have to set the cache control of the Support File to public.

So - we have a bunch of javascript on one of the pages which gets pulled into the Support File - unless that support file is public the page doesn’t render in the Lightning Community. Will the Page sharing you mentioned work to fix that?