Fix key trusting instructions to work when we update our signing key
The simple version of the instructions that we give for people to increase their trust in our signing key rely on the sha256sum of the key file itself:
https://tails.boum.org/doc/get/trusting_tails_signing_key/
When we update our signing key file with new signatures, the hash of that file changes. This might lead users to think that they downloaded a wrong signing key file.
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Original created by @sajolida on 6318 (Redmine)