[Support] Briefest of brief production environment setup docs about identity-idp HOT 3 CLOSED

Hello. All the necessary configuration is in application.example.yml, which gets copied to your local machine as application.yml. We use the Figaro gem for configuration, and it comes with a handy command that will set all the proper env vars on Heroku based on the values in application.yml:

$ figaro heroku:set -e production

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Also, if you look at your Heroku logs, you should see a helpful message about what went wrong, most likely a message from Figaro saying that a required key was not set.

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Thanks @monfresh. If you folks are giving me the above advice (ie. you expect it should Just Work), I'm going to assume I am making a silly mistake that I should be embarrassed about...! :)

I'll do some sanity checks and am happy to submit any doc clarification that might help the next person. Really appreciate the nudge in the right direction. Sorry for the noise!

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