fix: explicitly set our preferred package manager for js dependencies

variants/frontend-base/template.rb

@@ -16,6 +16,16 @@
 # this will create a package.json for us
 run "rails shakapacker:install"
 
+# explicitly set our preferred package manager for external tooling
+File.write(
+  "./package.json",
+  JSON.generate(
+    JSON.load_file("./package.json").tap do |package_json|
+      package_json["packageManager"] = "[email protected]"
+    end
+  )
+)
+
 # this is added by shakapacker:install, but we've already got one (with some extra tags)
 # in our template, so remove theirs otherwise the app will error when rendering this
 gsub_file "app/views/layouts/application.html.erb",