Cache worker response for particular tickets, and purge it on deletion

[pawelgrzybek]

CF Workers finally support intuitive way of caching.
https://blog.cloudflare.com/workers-cache/

We should use this feature to cache all the individual ticket responses, and purge the cache tag associated with this ticket after deletion.

return new Response(body, {
  headers: {
    "Cache-Control": "public, max-age=300, stale-while-revalidate=3600",
    "Cache-Tag": "ticket:123",
  },
});

await ctx.cache.purge({ tags: ["ticket:123"] });