Function fetchDockerTagDate

packages/scripts/maintenance/lib/upstream.ts:535–546

(
  image: ImageRef,
  tag: string,
  opts: FetchOptions = {}
)

/** Last push date of a Docker Hub tag (the "Docker API" freshness signal). */
export async function fetchDockerTagDate(
  image: ImageRef,
  tag: string,
  opts: FetchOptions = {}
): Promise<string> {
  if (image.registry !== "dockerhub") return "";
  const r = await fetchJSON<any>(
    `https://hub.docker.com/v2/repositories/${image.name}/tags/${encodeURIComponent(tag)}`,
    { ...opts, allow404: true }
  );
  return iso(r?.last_updated ?? r?.tag_last_pushed);
}