The make validate-keyring CI jobs have started failing. It seems the issue is that some maintainers' keys are no longer being exported for various reasons.

• @mrunalp appears to have deleted their PGP keys:

  % curl https://github.com/mrunalp.gpg
  -----BEGIN PGP PUBLIC KEY BLOCK-----
  Note: This user hasn't uploaded any GPG keys.
  
  
  =twTO
  -----END PGP PUBLIC KEY BLOCK-----
  

• @thaJeztah's keys appear to be deemed invalid?

  % curl https://github.com/thaJeztah.gpg
  -----BEGIN PGP PUBLIC KEY BLOCK-----
  Note: The keys with the following IDs couldn't be exported and need to be reuploaded 76698F39D527CE8C
  
  
  =twTO
  -----END PGP PUBLIC KEY BLOCK-----
  

I will rustle up a patch to handle empty keys from github.com/$user.gpg but I thought I might as well let the affected maintainers know. This is quite strange. It also seems that my own exported keys from GitHub are also missing some keys...