Add template option to extend generated Terraform configuration

[tleguijt]

This could be useful for example to add extra custom Terraform providers.

For example with an terraform_extension_template: tf-tmpl.tf option in the MACH config.

[BramKaashoek]

A direct use case. For a component using Stripe as payment provider I need to include their provider:

terraform {
  required_providers {
    stripe = {
      source = "franckverrot/stripe"
      version = "1.8.0"
    }
  }
}

[tleguijt]

Also support variables (varfile and env) like so:

terraform {
  required_providers {
    stripe = {
      source = "franckverrot/stripe"
      version = "1.8.0"

      username = ${var.provider.username}
      username = ${env.STRIPE_USERNAME}
    }
  }
}

[mvantellingen]

I think this can now be achieved via plugins.

Of course creating a plugin for only adding a provider seems overkill. But it's quite easy to create a reusable provider setting plugin (mach-composer-plugin-add-providers)

Agree to close?

[tleguijt]

Agree with the approach. Let's close this once we have some clear instructions on this in the documentation