Move var.secrets into var.namespaces

[syedrakib]

Allows declaring secrets without having to repeat the namespace name for every single secret that is declared. This also reduces chances of typos and mistakes.

OLD WAY:

module "gke_cluster" {
  source = "airasia/gke_cluster/google"
  ......
  ......
  ......
  ......
  ......
  namespaces = [
    {
      name   = "myns"
      labels = {}
    }
  ]
  secrets = {
    "myns:mysqldb" = {
      username = module.mysql_db.root_user_name
      password = module.mysql_db.root_user_password
    }
    "myns:postgresdb" = {
      username = module.postgres_db.root_user_name
      password = module.postgres_db.root_user_password
    }
    "myns:sqlserverdb" = {
      username = module.sqlserver_db.root_user_name
      password = module.sqlserver_db.root_user_password
    }
  }
}

NEW WAY

module "gke_cluster" {
  source = "airasia/gke_cluster/google"
  ......
  ......
  ......
  ......
  ......
  namespaces = [
    {
      name   = "myns"
      labels = {}
      secrets = {
        mysqldb = {
          username = module.mysql_db.root_user_name
          password = module.mysql_db.root_user_password
        }
        postgresdb = {
          username = module.postgres_db.root_user_name
          password = module.postgres_db.root_user_password
        }
        sqlserverdb = {
          username = module.sqlserver_db.root_user_name
          password = module.sqlserver_db.root_user_password
        }
      }
    }
  ]
}

[itsmunim]

Looks good.