main.tf

resource "github_team_repository" "tf_test" {
  for_each = local.repo_tf_test.permission
  repository = github_repository.tf_test_repo.name
  team_id    = each.key
  permission = each.value
}

variables.tf

locals {
    repo_tf_test = {
      permission = {
        (github_team.tf_test_team[0].id) = "pull"
        (github_team.tf_test_team[3].id) = "push"
        (github_team.tf_test_team[4].id) = "admin"
        (github_team.tf_test_team[8].id) = "triage"
    }
  }
}

locals {
  repo_perms = {
    repo_tf_test = {
      permissions = {
          (github_team.tf_test_team[0].id) = "pull"
          (github_team.tf_test_team[3].id) = "push"
          (github_team.tf_test_team[4].id) = "admin"
          (github_team.tf_test_team[8].id) = "triage"
        }
    },
    repo_tf_test2 = {
      permissions = {
          (github_team.tf_test_team[1].id) = "pull"
          (github_team.tf_test_team[2].id) = "push"
          (github_team.tf_test_team[4].id) = "admin"
          (github_team.tf_test_team[6].id) = "triage"
        }
    }
  }
}