Commits on Sep 6, 2020

1. Fix docker buildfile …

   Was resulting in an error when attempting to run the build:
     app_1    | /usr/local/bundle/gems/thor-1.0.1/lib/thor/parser/arguments.rb:133:in `parse_numeric': Expected numeric value for '--port'; got "${APP_PORT}" (Thor::MalformattedArgumentError)
   
   There are two things that aren't quite set up right here:
   
   The build arg was not in scope -- used args need to be _below_ the
   `FROM` statement to be accessible.
   
   CMD appears to not allow variable expansion, because it is processed at
   runtime rather than build time.  Instead, we can export the `PORT`
   envar, which will be picked up by `config/puma.rb` when starting rails.

   

   cflipse committed Sep 6, 2020
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