Setting Up S3 CDN

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Setting up S3 is a matter of uncommenting some settings in your config/storage.yml file:
amazon:
  service: S3
  access_key_id: <%=ENV.fetch("AWS_ACCESS_KEY_ID")%>
  secret_access_key: <%= ENV.fetch("AWS_SECRET_ACCESS_KEY") %>
  region: us-west-1
  bucket: bigrails
  public: true
You then need to set config/environments/production.rb to use the amazon provider:
config.active_storage.service = :amazon