New Twiddle

controllers.application.js

import Controller from '@ember/controller';

export default Controller.extend({
  init(){
    this._super(...arguments);
    this.set('images', [
      "https://avatars0.githubusercontent.com/u/4096934?s=460&v=4"
    ]);
  }
});

templates.application.hbs

{{#each images as |img|}}
    <img
      class="d-block w-100"
      src={{img}}
      alt="Post Image"
    >
{{/each}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  }
}