Include Rack::MethodOverride middleware for API only apps

Otherwise POST requests with _method set to something else won't work.

Author: rosa

README.md

@@ -30,9 +30,9 @@ And that's it. With this alone, you should be able to access Mission Control Job
 
 ![Failed jobs tab in a simple app](docs/images/failed-jobs-simple.png)
 
-### API-only apps or apps using `vite_rails`
+### API-only apps or apps using `vite_rails` and other asset pipelines outside Rails
 
-If you want to use Mission Control – Jobs with an [API-only Rails app](https://guides.rubyonrails.org/api_app.html) or an app that's using `vite_ruby`/`vite_rails`, you need just one more thing: configure an asset pipeline so you can serve the JavaScript and CSS included in this gem. We recommend to use [`propshaft`](https://github.com/rails/propshaft). You simply need to add this line to your application's Gemfile:
+If you want to use this gem with an [API-only Rails app](https://guides.rubyonrails.org/api_app.html) or an app that's using `vite_ruby`/`vite_rails`, or some other custom asset pipeline different from Sprockets and Propshaft, you need just one more thing: configure an asset pipeline so you can serve the JavaScript and CSS included in this gem. We recommend to use [`Propshaft`](https://github.com/rails/propshaft). You simply need to add this line to your application's Gemfile:
 
 ```ruby
 gem "propshaft"

lib/mission_control/jobs/engine.rb

@@ -7,7 +7,12 @@ module Jobs
     class Engine < ::Rails::Engine
       isolate_namespace MissionControl::Jobs
 
-      config.middleware.use ActionDispatch::Flash unless config.action_dispatch.flash
+      initializer "mission_control-jobs.middleware" do |app|
+        if app.config.api_only
+          app.middleware.use ActionDispatch::Flash
+          app.middleware.use ::Rack::MethodOverride
+        end
+      end
 
       config.mission_control = ActiveSupport::OrderedOptions.new unless config.try(:mission_control)
       config.mission_control.jobs = ActiveSupport::OrderedOptions.new