[create-cloudflare] Respect CLOUDFLARE_ACCOUNT_ID environment variable

[petebacondarwin]

Fixes #[no related issue].

When running wrangler init (which delegates to C3), if CLOUDFLARE_ACCOUNT_ID is set in the environment, C3 now uses it directly instead of calling wrangler whoami and prompting for account selection.

This matches wrangler's own behavior for the CLOUDFLARE_ACCOUNT_ID environment variable and enables seamless CI/CD workflows where the account is pre-configured.

Summary

• Added check for CLOUDFLARE_ACCOUNT_ID at the start of chooseAccount() in C3
• When set, displays status message and uses that account ID directly
• Skips the wrangler whoami API call and account selection prompt

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• 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 aligns C3 behavior with existing wrangler behavior which is already documented

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[changeset-bot]

🦋 Changeset detected

Latest commit: cf4db23

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[claude]

Claude finished @petebacondarwin's task —— View job

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Changeset Review

✅ All changesets look good

The changeset .changeset/c3-respect-cloudflare-account-id-env.md follows all guidelines:

• Version Type: Correctly marked as minor (new behavior/feature)
• Changelog Quality: Clear, descriptive title and helpful body explaining the change and its benefit
• Markdown Headers: No h1/h2/h3 headers used ✓
• Format: Follows the recommended structure with good before/after context

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 3 additional findings.

[pkg-pr-new]

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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@cloudflare/workers-editor-shared

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@cloudflare/workers-utils

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wrangler

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commit: cf4db23