Verifying tag with wrong key gives confusing error message (not a signed tag)

If I specify a wrong key (via gpg_keyring) for verifying a signed tag during build (by setting tag_gpg_id: 1) I get the following error message:

Error: metrics-lib-2.11.0 is not a signed tag

However, that tag is clearly signed, I just happened to specify the wrong key. The error message is confusing and should point to the right problem instead.

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