M3U8 file support

Development
4

I wanna use videojs to play HLS videos.
I change discourse/lib/oneboxer.rb
add this code :

module Oneboxer
  ONEBOX_CSS_CLASS = "onebox"
  AUDIO_REGEX = /\A\.(mp3|og[ga]|opus|wav|m4[abpr]|aac|flac)\z/i
  VIDEO_REGEX = /\A\.(mov|mp4|webm|m4v|3gp|ogv|avi|mpeg|ogv)\z/i
  HLS_REGEX = /\A\.(m3u8)\z/i

 ***other code 
    when HLS_REGEX
      <<~HTML
      <script src="https://vjs.zencdn.net/8.10.0/video.min.js"></script>
      <link href="https://vjs.zencdn.net/8.10.0/video-js.css" rel="stylesheet" />
      <div class="onebox video-onebox">
        <video-js #{additional_controls} width="100%" height="100%"  class="vjs-default-skin" controls>
          <source src="#{normalized_url}">
        </video-js>
      </div>
      HTML

then I change discourse-docker project. I replace https://github.com/discourse/discourse.git
to my changed project.
I replace these files:

image/base/slim.Dockerfile
image/discourse_dev/postgres_dev.template.yml

But It not work.
If anyone can fix this feature?
I can pay for it.