export the nix-cache worker as a package

flake.nix

@@ -11,6 +11,22 @@
       forAllSystems = fn: nixpkgs.lib.genAttrs systems (system: fn nixpkgs.legacyPackages.${system});
     in
     {
+      packages = forAllSystems (pkgs: {
+        nix-cache = pkgs.buildNpmPackage {
+          pname = "nix-cache";
+          version = "0.1.0";
+          src = ./nix-cache;
+          npmDepsHash = "sha256-bIujU7pZa1ExCZOMOoxsTeLDSF1GuPN/oMSgiMhY/04=";
+          buildPhase = ''
+            npx wrangler deploy --dry-run --outdir dist
+          '';
+          installPhase = ''
+            mkdir -p $out
+            cp dist/index.js $out/
+          '';
+        };
+      });
+
       checks = forAllSystems (pkgs: {
         nix-cache-tests = pkgs.buildNpmPackage {
           pname = "nix-cache-tests";