feat(nixos): add copyparty opds volume

configs/nixos/hosts/pikachu/default.nix

@@ -198,6 +198,13 @@
           "dthumb"
         ];
       };
+      "/opds" = {
+        hostPath = "/pikachu/data/opds";
+        path = "/pikachu/data/opds";
+        access.r = [ "alexion" ];
+        readOnly = true;
+        flags = [ "opds" ];
+      };
     };
   };