{...}: {
  programs.ssh.matchBlocks."*".identityFile = "/home/chaos/.ssh/id_ed25519";
  programs.git.extraConfig = {
    gpg.format = "ssh";
    commit.gpgsign = "true";
    tag.gpgsign = "true";
    user.signingKey = "/home/chaos/.ssh/id_ed25519";
  };
}