django: upload with subkey

Baptiste Beauplatrequested to merge
lyknode/debexpo:dj/upload-with-subkey into django

Django migration: #47 (closed)

This MR builds on top of !101 (merged).

Fixes signed files with sub keys.

In order to avoid syncing a full keyring to the DB state, this approach stores fingerprint of the subkeys in a new model SubKey.

Edited by Baptiste Beauplat

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