80e12bf88c
With gpg sub keys one can rotate signing keys while having a stable trust anchor. So far one still had to ship the sub key out of band but a newer gpg has the option to include the sub key in the signature and import it automatically. This is safe if we only allow importing a sub key signed by the top key we already have in the key ring. Add the --auto-key-import argument to gpg to import subkeys but also set --import-options=merge-only,import-clean to restrict what we import to only be sub keys signed by the top key we have in the keyring and discard any irrelevant parts. The ugly part is that we also have to work on a temporary copy of the keyring because gpg wants to persist the added key material but we don't what that here.
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