Remove an implicit dependency on some ssh_config settings

morph/lib/make-issuer.nix

@@ -10,6 +10,7 @@
 , ...
 }: rec {
   deployment = {
+    targetUser = "root";
     targetHost = publicIPv4;
 
     secrets = {

morph/lib/make-storage.nix

@@ -14,6 +14,7 @@
 , ...
 }: rec {
   deployment = {
+    targetUser = "root";
     targetHost = cfg.publicIPv4;
 
     secrets = {

morph/lib/make-testing.nix

 { publicIPv4, hardware, publicStoragePort, ristrettoSigningKeyPath, passValue, sshUsers, stateVersion, ... }: rec {
 
   deployment = {
+    targetUser = "root";
     targetHost = publicIPv4;
 
     secrets = {