fix: Specify external db with non-standard port (#2711)

POSTGRES_PORT was not taking effect if provided separately
instead of using DATABASE_URL. This adds support for using
databases running on non-standard ports.

#1145
#1147

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

config/database.yml

@@ -3,6 +3,7 @@ default: &default
   encoding: unicode
   pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
   host: <%= ENV.fetch('POSTGRES_HOST', 'localhost') %>
+  port: <%= ENV.fetch('POSTGRES_PORT', '5432') %>
 
 development:
   <<: *default