Support resolving terraform version from config

[dkirrane]

I'm looking for a feature similar to actions/setup-go@v5 https://github.com/actions/setup-go?tab=readme-ov-file#getting-go-version-from-the-gomod-file

If we could pass a terraform-version-file that takes a path to a .tf file containing the terraform block with required_version e.g.

versions.tf

terraform {
  required_version = "1.3.6"
}

action

uses: hashicorp/setup-terraform@v3
with:
    terraform-version-file: 'path/to/versions.tf'

Or better still just automatically find the .tf file with required_version config

[vsamofal]

I do use this action to get a version dflook/terraform-version@v1 (cool to have it built in, but at least some workaround)