hermes/home: update ssh for cloudflare

hosts/hermes/home.nix

@@ -53,6 +53,7 @@
         "git.bhankas.org" = {
           user = "gitea";
           hostname = "git.bhankas.org";
+          identityFile = [ "~/.ssh/id_ed25519" ];
           proxyCommand = "${pkgs.cloudflared}/bin/cloudflared access ssh --hostname %h";
         };
       };