let the file entry be a fully qualified URL rather than just a filename

Regarding the update issues of Firefox, I had the idea to create a "proxy" repository:

• The "proxy" repository will only contain the meta-data (and the icons, etc.)
• The apks are still at the Mozilla server
• The index.xml file will point to the download URL at mozilla.
• User can then just configure this repo.
• Optional: As a service for the users, the f-droid client could have this repo pre-configured like the guardianprojects's.

This repo could be updated automatically by either a cron-job at the f-droid servers or by a scheduled job at gitlab. In the later case the created meta-data would be uploaded to gitlab-pages as artifacts. (Details can be decided later.)

What do you think about this idea?

Questions:

• Can the index-format already contain download-URLs?
• Is the client able to handle such download-URLs?
• Would the client be able to install an .apk downloaded from a mozilla server?
• What does the proxy-repo need to provide? (e.g. key, fingerprint, etc.)