Use sops for private key distribution

nixos/modules/borgbackup.nix

@@ -132,11 +132,18 @@ in {
       };
     };
     environment.persistence.${config.impermanence.name} = {
-      users.fsaccount.directories = [
+      users.fsaccount.files = [
+        /*
           {
-          directory = ".ssh"; # SSH Key with access to FS Account and known_hosts
+          file = ".ssh/known_hosts";
+          parentDirectory = {
+            user = "fsaccount";
+            group = "users";
             mode = "u=rwx,g=,o=";
+          };
         }
+        */
+        ".ssh/known_hosts"
       ];
     };
     sops.secrets.backupKey = {