[tor-bugs] #30642 [Core Tor/Tor]: Add an ed25519_identity file to the data directory

[Tor Bug Tracker & Wiki]

#30642: Add an ed25519_identity file to the data directory
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     Reporter:  teor          |      Owner:  (none)
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: unspecified
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-relay
Actual Points:                |  Parent ID:  #22029
       Points:  1             |   Reviewer:
      Sponsor:                |
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 Relays print their RSA fingerprint to a "fingerprint" file in their data
 directory.

 We need an equivalent file for base-64 encoded ed25519 public keys.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30642>
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