title: Deploy elixir phoenix application to heroku - Can not add buildpack
body: <p>So I am trying to deploy my Elixir phoenix web application to Heroku. I am following this guide: <a href="https://hexdocs.pm/phoenix/heroku.html" rel="nofollow noreferrer">https://hexdocs.pm/phoenix/heroku.html</a></p>
  
  <p>But when I get to the point where I need to add a buildpack:</p>
  
  <blockquote>
    <p>heroku buildpacks:add <a href="https://github.com/gjaldon/heroku-buildpack-phoenix-static.git" rel="nofollow noreferrer">https://github.com/gjaldon/heroku-buildpack-phoenix-static.git</a></p>
  </blockquote>
  
  <p>I get this error:</p>
  
  <blockquote>
    <p>Couldn't find that app.</p>
  </blockquote>