[miniflare] Await workerd exit before local container cleanup

[ghostwriternr]

Miniflare currently force-kills workerd on dispose. That is the right default for ordinary Workers, because Chrome can keep HTTP connections open for about 10s. For Durable Object containers it is wrong: workerd owns the application container and the proxy-everything sidecar, and it can remove them only while its Docker connection is still alive.

This sends SIGTERM when the serialized workerd config includes a Durable Object container, waits for the process to exit, and falls back to SIGKILL after five seconds. Wrangler and the Vite plugin now dispose Miniflare before deleting containers by their prepared image tags.

Do not merge until workers-sdk pins a workerd release that performs that sidecar cleanup. The Docker fixture asserts that both runtime containers are gone after close; that assertion is expected to fail on the current pin.

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: this is local-dev shutdown behavior; there is no new config or public API.

[changeset-bot]

🦋 Changeset detected

Latest commit: db81b9d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 8 packages

Name	Type
miniflare	Patch
@cloudflare/deploy-helpers	Patch
@cloudflare/pages-shared	Patch
@cloudflare/remote-bindings	Patch
@cloudflare/runtime-types	Patch
@cloudflare/vite-plugin	Patch
@cloudflare/vitest-plugin	Patch
wrangler	Patch

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commit: db81b9d