Add missing envvars to docker-compose to fix SMTP errors in Sidekiq

[icarito]

We've had some errors from Sidekiq that it could not find the smtp host: https://sentry.io/share/issue/e1e982cd853e40abb440c7d4f40755b2/

It was missing references to the SMTP server. Previously this was fine as we were using the default configuration.

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[icarito]

I've put the SMTP lines in docker-compose-production to test as a hotfix. We should now stop seeing this error in Sentry for production.

[icarito]

This seems to have had the desired effect as a hotfix. Let's merge it.