providers/heroku: Document environment variables
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@ -33,6 +33,8 @@ resource "heroku_app" "default" {
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The following arguments are supported:
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* `api_key` - (Required) Heroku API token
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* `email` - (Required) Email to be notified by Heroku
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* `api_key` - (Required) Heroku API token. It must be provided, but it can also
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be sourced from the `HEROKU_API_KEY` environment variable.
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* `email` - (Required) Email to be notified by Heroku. It must be provided, but
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it can also be sourced from the `HEROKU_EMAIL` environment variable.
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