fix dockerfile path resolution

[emily-shen]

Fixes DEVX-2036

• resolves the dockerfile path relative to the wrangler config path, falling back on the cwd.
• also extracts containers deploy tests out of the really really big deploy.test.ts file because working with a 14,000 line file is not fun. also consolidates mocks that are repeated in the container deploy tests.
• i would like to add a test for dev as well, but we already have this PR: add container rebuild hotkey + dev cleanup tests #9728 which was actually dependent on this path resolution being fixed. this bug is blocking quite a few things, so i'll leave the dev test for that PR. I have manually verified this behaviour is fixed in dev - you can easily test it by running wrangler dev -c ../container-app/wrangler.jsonc from a random fixture.

please review by commit

The long term solution should be to normalise the config so that it passes around the absolute path for the dockerfile. This would require some containers config refactoring, which we are doing in a separate follow up PR.

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

[changeset-bot]

🦋 Changeset detected

Latest commit: 20027bf

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

This PR includes changesets to release 4 packages

Name	Type
@cloudflare/containers-shared	Patch
wrangler	Patch
@cloudflare/vite-plugin	Patch
@cloudflare/vitest-pool-workers	Patch

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[github-actions]

Failed to automatically backport this PR's changes to Wrangler v3. Please manually create a PR targeting the v3-maintenance branch with your changes. Thank you for helping us keep Wrangler v3 supported!

Depending on your changes, running git rebase --onto v3-maintenance main emily/isdockerfile-bug might be a good starting point.

Notes:

• your PR branch should be named v3-backport-9872
• add the skip-v3-pr label to the current PR to stop this workflow from failing

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create-cloudflare

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@cloudflare/kv-asset-handler

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miniflare

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@cloudflare/pages-shared

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@cloudflare/unenv-preset

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@cloudflare/vite-plugin

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@cloudflare/vitest-pool-workers

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wrangler

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commit: 20027bf

[dario-piotrowicz]

LGTM 😄