try pulling an image even if docker login fails

[emily-shen]

Fixes CC-6472

Previously the only image registry allowed was the cloudflare managed one, and the only way to auth with that was to query the containers api for credentials. So we always did that before pulling an image. The vite plugin (for various reasons) couldn't call that api, so registry uris didn't work at all with the vite plugin.

Now we support some external registries, which users could authenticate with directly using docker login, so let's try pulling the image anyway even if calling our API fails. The API might return (short-lived) credentials for external registries if this has been previously configured via wrangler contaienrs registries configure, so it is worth trying to call it still.

The cloudflare-managed registry still wont work with the vite plugin as the only way to get credentials for that is via our API, so this PR also adds a more helpful error message in that case.

Also note that I'm not sure if it is worth adding CI tests for this, since it would involve having to set up a wrangler AWS or dockerhub account to run those tests, and storing secrets for that on this github repo, and introducing a likely spot for flakes.

However, i have tested this manually by:

1. pointing a wrangler config to an ECR image
2. logging in using docker login
3. running wrangler dev and vite dev

---

• Tests
  • Tests included
  • Tests not necessary because: see description
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: bugfix
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: containers

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Latest commit: 6e84a34

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commit: 6e84a34