CC-6583: Add support for SSH TrustedUserCAKeys

[gpanders]

Part of CC-6583.

Add support for trusted_user_ca_keys.

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• Tests
  • Tests included/updated
  • Tests not necessary because:
• Public documentation
  • Cloudflare docs PR(s): CC-4634: add containers ssh docs cloudflare-docs#25076
  • Documentation not necessary because:
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: not supported in v3

A picture of a cute animal (not mandatory, but encouraged)

[changeset-bot]

🦋 Changeset detected

Latest commit: e91a5ce

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

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[claude]

Claude finished @gpanders's task —— View job

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Changeset Review

✅ All changesets look good

The changeset .changeset/brave-plants-dream.md passes all validation criteria:

• ✅ Version Type: Correctly uses minor for new feature (adding trusted_user_ca_keys configuration)
• ✅ Changelog Quality: Clear title and helpful description with usage example
• ✅ Markdown Headers: No h1/h2/h3 headers used
• ✅ Package Coverage: Correctly lists all affected packages (@cloudflare/containers-shared, @cloudflare/workers-utils, wrangler)

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commit: e91a5ce