[Proposal] github_actions_identity module

[balanza]

List of changes

• Added new module

Motivation and context

I don't know how to contribute proficiently to this repo, but still I spotted the opportunity to propose this module, as we are currently repeating the same configuration across several repository.

The intended usage should be

module my_gh_actions {
  source = "git::https://github.com/pagopa/terraform-azurerm-v3.git//github_actions_identity?ref=v6.3.0"
  
  project = "my-app"
  env = "prod"

  environment_cd_roles = {
    subscription = [
      "Reader",
    ]
    resource_groups = {
      my-app-rg = [
        "Website Contributor",
      ]
    }
  }

  github_repository_environment_cd = {
    protected_branches     = true
    custom_branch_policies = false
    reviewers_teams        = ["my-team"]
  }

}

Type of changes

• [*] Add new module
• Update existing module
• Remove existing module

Does this introduce a breaking change?

• Yes
• No

Other information

Run checks

Useful commands to run checks on local machine

bash .utils/terraform_run_all.sh init local
pre-commit run -a