title: Can't decrypt config/credentials.yml.enc
body: <p>I am using Heroku with Rails 6 and Postgres. I am trying to use <code>heroku open</code> to start the app, but the build fails and this is shown in the logs:</p>
  
  <pre><code>-----&gt; Detecting rake tasks
  -----&gt; Preparing app for Rails asset pipeline
         Running: rake assets:precompile
         DEPRECATION WARNING: Including LoggerSilence is deprecated and will be removed in Rails 6.1. Please use `ActiveSupport::LoggerSilence` instead (called from &lt;top (required)&gt; at /tmp/build_9537ba0878cb8933c15686548eb3ccb5/config/application.rb:7)
         Missing encryption key to decrypt file with. Ask your team for your master key and write it to /tmp/build_9537ba0878cb8933c15686548eb3ccb5/config/master.key or put it in the ENV['RAILS_MASTER_KEY'].
   !
   !     Precompiling assets failed.
   !
   !     Push rejected, failed to compile Ruby app.
   !     Push failed
  </code></pre>
  
  <p>I have tried to run some of the commands mentioned in these two links, but none seem to work:</p>
  
  <p><a href="https://github.com/rails/rails/issues/32947" rel="nofollow noreferrer">https://github.com/rails/rails/issues/32947</a></p>
  
  <p><a href="https://stackoverflow.com/questions/44298334/ask-your-team-for-your-master-key-and-put-it-in-envrails-master-key-on-herok">Ask your team for your master key and put it in ENV[&quot;RAILS_MASTER_KEY&quot;] on heroku deploy</a></p>
  
  <p>I'm also wondering if these workflows are environment specific.</p>