Fix port for Kamal (80 instead of 3000)

Author: Uriel Alonso

config/deploy.yml

@@ -21,6 +21,7 @@ builder:
 
 env:
   clear:
+    PORT: 80
     RAILS_ENV: production
   secret:
     - RAILS_MASTER_KEY

config/puma.rb

@@ -29,7 +29,7 @@
 threads threads_count, threads_count
 
 # Specifies the `port` that Puma will listen on to receive requests; default is 3000.
-port ENV.fetch("PORT", 3000)
+port ENV.fetch("PORT", 80)
 
 # Allow puma to be restarted by `bin/rails restart` command.
 plugin :tmp_restart