@spec always_pull() :: %Testcontainers.PullPolicy{
  always_pull: term(),
  pull_condition: term()
}

@spec never_pull() :: %Testcontainers.PullPolicy{
  always_pull: term(),
  pull_condition: term()
}

@spec pull_condition(
  expr :: (config :: struct(), conn :: Tesla.Env.t() -> true | false)
) ::
  %Testcontainers.PullPolicy{always_pull: term(), pull_condition: term()}