[Containers] Add Google Artifact Registry as a supported external registry

[sherryliu-lsy]

Summary

Documents Google Artifact Registry (GAR) as a supported external registry for Containers, alongside Docker Hub and Amazon ECR. Wrangler and Cloudchamber now support pulling pre-built images from *-docker.pkg.dev registries, so this adds the configuration and usage documentation.

• Add "Use private Google Artifact Registry images" section to image management, covering the --gar-email flag, service-account setup, and CI flag/stdin paths
• Note that only *-docker.pkg.dev hosts are supported (gcr.io is not)
• List GAR in the supported-registry references and local dev notes
• Document --dockerhub-username, --aws-access-key-id, and --gar-email flags for registries configure
• Add changelog entry for GAR image support

Related Wrangler change: cloudflare/workers-sdk#14311

Screenshots (optional)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

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⚠️ 4 warnings, 💡 2 suggestions found in commit 1f0d1a8.

Code Review

This code review is in beta and may not always be helpful — use your judgment.

Warnings (1)

File

Issue

containers/platform-details/image-management.mdx line 207

Incorrect stdin credential behavior — The added line claims the service account key can be provided through stdin as a file path. For non-interactive pipes the secret value itself is sent through stdin; passing a file path would store the literal path string as the credential. Fix: Change the stdin guidance to say it accepts the raw JSON key contents or base64-encoded JSON, and keep the file-path option only for the interactive prompt.

Suggestions (1)

File	Issue
containers/platform-details/image-management.mdx line 252	Inconsistent Wrangler config format — The GAR example uses TOML ([[containers]]) while the Docker Hub and Amazon ECR examples in the same page use JSON. Fix: Use the same JSON Wrangler configuration format as the other registry examples so readers can compare them directly.

Style Guide Review

Warnings (3)

File	Issue
containers/platform-details/image-management.mdx line 250	must use TOML input — <WranglerConfig> wraps a ```json fence instead of TOML Fix: Provide the Wrangler configuration as ```toml inside <WranglerConfig>; JSON output is auto-generated
changelog/containers/2026-06-18-google-artifact-registry-images.mdx line 12	Internal links must use root-relative paths — Line uses https://developers.cloudflare.com/workers/wrangler/configuration/#containers for an internal link Fix: Change link to /workers/wrangler/configuration/#containers
changelog/containers/2026-06-18-google-artifact-registry-images.mdx line 22	WranglerConfig must use TOML input — Line uses a jsonc code block inside `<WranglerConfig>` Fix: Provide the example as toml; JSON is auto-generated

Suggestions (1)

File	Issue
containers/platform-details/image-management.mdx line 308	Oxford comma — List of three items joined by or with no comma before or: Docker Hub, Amazon ECR, or Google Artifact Registry Fix: Add a serial comma: Docker Hub, Amazon ECR, or Google Artifact Registry → Docker Hub, Amazon ECR, or Google Artifact Registry

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