Setup terraform-quality workflow

[padok-enabler-github-app]

This PR adds a terraform-quality workflow to this Terraform repository.

This workflow runs on every PR to default branch and checks the quality of the Terraform code. It runs several linters and static analysis tools on Terraform code.

It is a reusable workflow stored in padok-team/github-workflows repository.

tflint configuration

Since the v0.40.0 release, tflint plugins such as aws or gcp must be declared in the .tflint.hcl file, your workflow will fail otherwise.

Here are common configurations for the most used providers:

• AWS: tflint-ruleset-aws plugin

  // .tflint.hcl
  plugin "aws" {
      enabled = true
      version = "0.21.1"
      source  = "github.com/terraform-linters/tflint-ruleset-aws"
  }
  

• GCP: tflint-ruleset-google plugin

  // .tflint.hcl
  plugin "google" {
      enabled = true
      version = "0.22.1"
      source  = "github.com/terraform-linters/tflint-ruleset-google"
  }

• Azure: tflint-ruleset-azurerm plugin

  // .tflint.hcl
  plugin "azurerm" {
      enabled = true
      version = "0.20.0"
      source  = "github.com/terraform-linters/tflint-ruleset-azurerm"
  }

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