Using HTTPS breaks package listing in storage service web interface

[jens-st]

Expected behaviour
List of all packages when clicking "Packages" within Archivematica storage service.

Current behaviour
No list, stuck on "Processing...".

Steps to reproduce

• Using steps/templates described in Configure Archivematica with SSL.
• "Site URL" & "Storage Service URL" in dashboard and pipeline "Remote Name" in storage service all set to an "https://"-based URL
• Debugging "context" in https://github.com/artefactual/archivematica-storage-service/blob/stable/0.20.x/storage_service/locations/views.py#L79 shows, it uses an 'http://'-based URL trying to load data from the server when generating the package listing.

Your environment (version of Archivematica, operating system, other relevant details)

• Archivematica v1.14.1
• Storage Service v0.20.1
• Ubuntu Server 18.04.6 LTS

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