Terraform 0.13 Compatibility

[skorfmann]

This adds Terraform 0.13 compatibility - Fixes #118

Noteworthy Changes:

• We download the 0.12 and 0.13 Terraform binaries in hashicorp/jsii-terraform docker image.
• Introduces build matrix for 0.12 / 0.13
• For hashicorp maintained providers, cdktf.json provider specifications can stay as they are today
• For all other providers (e.g. docker), the provider specification has to be changed to a more specific name

Example

AWS Provider

This will work with Terraform 0.12 and 0.13, since HashiCorp maintained providers will be automatically handled by Terraform 0.13 as well.

{
  "language": "typescript",
  "app": "npm run --silent compile && node main.js",
  "terraformProviders": [
    "aws@~> 2.0"
  ]
}

Docker Provider

This will work with Terraform 0.12 and 0.13, since the source is ignore in 0.12

{
  "language": "typescript",
  "app": "npm run --silent compile && node main.js",
  "terraformProviders": [
    "terraform-providers/docker@~> 2.0"
  ]
}

This will only work in 0.12

{
  "language": "typescript",
  "app": "npm run --silent compile && node main.js",
  "terraformProviders": [
    "docker@~> 2.0"
  ]
}

Dependencies

This still needs #36 /cc @anubhavmishra

[anubhavmishra]

I updated the jsii-terraform image with 0.12 and 0.13 binaries. We won't use tfenv for switching between Terraform versions as it requires us to install it by cloning the GitHub repo. We chose a simpler approach by installing the Terraform binaries from HashiCorp releases.

[github-actions]

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