feat(nix-compat/narinfo/pubkey): derive Clone, [Partial]Eq

We want to use this in another struct that we want to compare and clone.

Change-Id: I5c11d589a4922d85e190e1a9199468411016ff1e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11887
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: Brian Olsen <me@griff.name>
Tested-by: BuildkiteCI

tvix/nix-compat/src/narinfo/public_keys.rs

@@ -11,7 +11,7 @@ use super::Signature;
 /// This represents a ed25519 public key and "name".
 /// These are normally passed in the `trusted-public-keys` Nix config option,
 /// and consist of a name and base64-encoded ed25519 pubkey, separated by a `:`.
-#[derive(Debug)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct PubKey {
     name: String,
     verifying_key: VerifyingKey,