Fix strict host key check error

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/installer/users/nick/configs/console/git/default.nix

@@ -21,7 +21,10 @@
         hostname = "github.com";
         user = "git";
         identityFile = "${home}/.ssh/ssh_personal_ed25519_key";
-        extraOptions.StrictHostKeyChecking = "no";
+        extraOptions = {
+          StrictHostKeyChecking = "no";
+          UserKnownHostsFile = "/dev/null";
+        };
       };
     };
   };