Missing resources in heroku-provider

[hashibot]

This issue was originally opened by @abtris as hashicorp/terraform#5649. It was migrated here as part of the provider split. The original body of the issue is below.

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We use Heroku very extensively and I try use terraform for describing our apps and these things are missing.

• App Feature - preboot is important feature and more (log-runtime-metrics, runtime-dyno-metadata)
• Account Feature - this is used for many labs things (metrics-beta) - optional
• Formation - I see open PR

[kubek2k]

Formation - I see open PR

this is one is hard due to the fact that you can't scale the app as long as Procfile is not in place, and in the app creation process that is simply impossible.

[joestump]

@kubek2k we have teams at Salesforce that do this with a local-exec provisioner. It's a bit on the Rube Goldberg side of solutions, but it works.

[kubek2k]

I was wondering that, maybe, it would make sense for Heroku to accept any formation upfront, and scale as soon as assumed Procfile entries are in place.

[davidji99]

App Feature/Formation resource have already been implemented.