Fix nix2container skopeo patch hash (TraceMachina#1294)

A change in GitHub's hashing scheme caused this to evaluate differently.
Add a temporary override to nix2container to unbreak CI.

Author: aaronmondal

flake.lock

@@ -18,7 +18,8 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
     nix2container = {
-      url = "github:nlewo/nix2container";
+      # TODO(aaronmondal): Remove this once it lands in nix2container main.
+      url = "github:nlewo/nix2container/80e34774e5904aae7a3542bc3b70dab1fe048587";
       inputs.nixpkgs.follows = "nixpkgs";
       inputs.flake-utils.follows = "flake-utils";
     };