Only run enable_first build commands the first time an env is enabled

[jlyon]

https://github.com/terra-ops/terra-ui-prototype has

drush {{alias}} site-install standard --db-url=mysql://drupal:drupal@database/drupal -y

in the enable_first section of .terra.yml.

Currently on my localhost, re-enabling an existing environment runs these commands and my Drupal db gets wiped. Perhaps a flag isn't getting set properly somewhere?

[jonpugh]

Yeah... I never finished this part!

We need some way to detect that the environment has never been enabled before! I am not sure how yet, would love help on this, and should probably just revert back to "enable" to not make people think they are safe to have this hook reinstall the site.

[jlyon]

How about checking if drush status throws errors?