Add git info to Terraform tags

main.tf

data "external" "gitrepo" {
  program = [
    "bash",
    "-c",
    <<-EOF
      echo "{ \
        \"branch\":\"$(git rev-parse --abbrev-ref HEAD)\", \
        \"sha\":\"$(git rev-parse --short=8 HEAD)\", \
        \"url\":\"$(git remote get-url origin)\" \
      }"
    EOF
  ]
}

locals {
  common_tags = {
    terraform  = "true"
    env        = "dev"
    app_name   = "your-app-here"
    repository = data.external.gitrepo.result.url
    branch     = data.external.gitrepo.result.branch
    sha        = data.external.gitrepo.result.sha
    created_by = "DevOps"
  }
}