* Update the production deployment workflow to target the main Heroku app
Without exposing our internal Heroku app name!
* Refactor the staging deployment script a bit to match more closely
* Use the HEROKU_PRODUCTION_APP_NAME Secret in the workflow
* Add a note about the newly required environment variable for production deployment into the local deploy script
* Add critical errors if the HEROKU_PRODUCTION_APP_NAME is missing
* Extract HEROKU_PRODUCTION_APP_NAME from process.env
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