Add the local grid deploy key (public and private!)

Use convention to find the file from which the public key can be read.

morph/grid/local/grid.nix

@@ -15,7 +15,7 @@ let
   # Configure deployment management authorization for all systems in the grid.
   deployment = {
     services.private-storage.deployment = {
-      authorizedKey = config.deployKey;
+      authorizedKey = builtins.readFile "${config.publicKeyPath}/deploy_key.pub";
       gridName = "local";
     };
   };

morph/grid/local/private-keys/deploy_key

+-----BEGIN OPENSSH PRIVATE KEY-----
+b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
+QyNTUxOQAAACADU1IBThyH0blWBG8afIA/h/bmVdUQkFAuAIQgAWE+ewAAAJjsA+8c7APv
+HAAAAAtzc2gtZWQyNTUxOQAAACADU1IBThyH0blWBG8afIA/h/bmVdUQkFAuAIQgAWE+ew
+AAAED6aLiQi/K2qG8sLsvV8Xar9PjJeFxKfb+GUvmseu8TqQNTUgFOHIfRuVYEbxp8gD+H
+9uZV1RCQUC4AhCABYT57AAAADmV4YXJrdW5AYmFyeW9uAQIDBAUGBw==
+-----END OPENSSH PRIVATE KEY-----

morph/grid/local/public-keys/deploy_key.pub

+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIANTUgFOHIfRuVYEbxp8gD+H9uZV1RCQUC4AhCABYT57 exarkun@baryon