Use sops for private key distribution

nixos/modules/borgbackup.nix

@@ -132,6 +132,15 @@ in {
       };
     };
     environment.persistence.${config.impermanence.name} = {
+      /*
+          users.fsaccount.directories = [
+          {
+            directory = ".ssh"; # SSH Key with access to FS Account and known_hosts
+            mode = "u=rwx,g=,o=";
+          }
+        ];
+      };
+      */
       users.fsaccount.files = [
         {
           file = ".ssh/known_hosts";