production:
  <<: *default
  url: <%= ENV['DATABASE_URL'] %>

postgres://[username]:[password]@aws-eu-west-1-portal.0.dblayer.com:10155/db-table

export DATABASE_URL="postgres://[username]:[password]@aws-eu-west-1-portal.0.dblayer.com:10155/DB-TABLE"

bin/cap production deploy

cap aborted!
SSHKit::Runner::ExecuteError: Exception while executing as deploy@ip-address: bundle exit status: 5
bundle stdout: An error occurred while installing pg (0.18.1), and Bundler cannot continue.
Make sure that `gem install pg -v '0.18.1'` succeeds before bundling.
bundle stderr: Nothing written