shopify-cli: avoid `lib.fileset`

pkgs/by-name/sh/shopify-cli/package.nix

···
   pname = "shopify";
   version = version;
 
-  src = lib.fileset.toSource {
-    root = ./.;
-    fileset = with lib.fileset; unions [
-      ./package.json
-      ./package-lock.json
-    ];
-  };
+  src = ./manifests;
 
   npmDepsHash = "sha256-QhbOKOs/0GEOeySG4uROzgtD4o7C+6tS/TAaPcmC3xk=";
   dontNpmBuild = true;

pkgs/by-name/sh/shopify-cli/update.sh

···
     exit 0
 fi
 
+pushd manifests
+
 # Update the package.json
 sed -i "s|$UPDATE_NIX_OLD_VERSION|$version|g" package.json
 
···
 rm -f package-lock.json
 npm i --package-lock-only
 npm_hash=$(prefetch-npm-deps package-lock.json)
+
+popd
+
 sed -i "s|npmDepsHash = \".*\";|npmDepsHash = \"$npm_hash\";|" package.nix
 
 popd