build: 🔧 Stimulus setup

webpack service added to docker-compose, rails webpacker config, application js and css tags updated

rails webpacker support

app/javascript/controllers/hello_controller.js

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+// Visit The Stimulus Handbook for more details 
+// https://stimulusjs.org/handbook/introduction
+// 
+// This example controller works with specially annotated HTML like:
+//
+// <div data-controller="hello">
+//   <h1 data-target="hello.output"></h1>
+// </div>
+
+import { Controller } from "stimulus"
+
+export default class extends Controller {
+  static targets = [ "output" ]
+
+  connect() {
+    this.outputTarget.textContent = 'Hello, Stimulus!'
+  }
+}

app/javascript/controllers/index.js

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+// Load all the controllers within this directory and all subdirectories. 
+// Controller files must be named *_controller.js.
+
+import { Application } from "stimulus"
+import { definitionsFromContext } from "stimulus/webpack-helpers"
+
+const application = Application.start()
+const context = require.context("controllers", true, /_controller\.js$/)
+application.load(definitionsFromContext(context))

app/javascript/packs/application.js

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+/* eslint no-console:0 */
+// This file is automatically compiled by Webpack, along with any other files
+// present in this directory. You're encouraged to place your actual application logic in
+// a relevant structure within app/javascript and only use these pack files to reference
+// that code so it'll be compiled.
+//
+// To reference this file, add <%= javascript_pack_tag 'application' %> to the appropriate
+// layout file, like app/views/layouts/application.html.erb
+
+
+// Uncomment to copy all static images under ../images to the output folder and reference
+// them with the image_pack_tag helper in views (e.g <%= image_pack_tag 'rails.png' %>)
+// or the `imagePath` JavaScript helper below.
+//
+// const images = require.context('../images', true)
+// const imagePath = (name) => images(name, true)
+//= require turbolinks
+
+console.log('Hello World from Webpacker')
+
+import "controllers"
+
+import "stylesheets"

app/javascript/stylesheets/index.css

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+.btn {
+	background-color: green;
+}