De-index /resources/ and merge the Docker container post into the Docker guide

[vpetersson-bot]

Two pages were competing with stronger pages for the same searches. This resolves both.

De-index /resources/

/resources/ was appearing in search results for tool-related queries and ranking well below the pages that should answer them, without adding anything of its own.

Rather than special-casing one page, this adds a reusable noindex frontmatter flag:

• layouts/partials/head.html previously hardcoded index, follow into the robots and googlebot meta tags for every page, so there was no way to keep a page available to visitors while removing it from search results. The tags now honour the flag.
• Adds layouts/sitemap.xml so flagged pages are omitted from the sitemap. It otherwise reproduces Hugo's default output.

/resources/ stays published, linked and reachable. All 44 internal links to it are unaffected. Sitemap goes from 345 to 344 URLs, the single removal being /resources/.

Merge the Docker container post into the Docker guide

/guides/docker/ and the September 2024 post How to generate an SBOM from a Docker container covered the same material.

The guide survives. It ranks better than the post, sits alongside the other language and platform guides, and has an evergreen URL rather than a dated one.

Carried over from the post:

• A new "What Image Scanning Does and Does Not Capture" section covering why scanning an image misses binaries copied in during the build, why multi-stage builds compound the problem, and the recommendation to keep the container SBOM separate from the application SBOM. The guide had no equivalent caveat up front, and this is the post's most valuable content.
• The docker sbom command for Docker Desktop, added to Alternative Tools.

The post's Trivy section is deliberately not carried over. Trivy was already removed from the guide's tool list after the March 2026 compromise.

The old post URL redirects to the guide via a Hugo alias, and the guide's Further Reading entry pointing at the post is removed.

Verification

• hugo --minify --environment production builds clean
• dprint check passes
• Redirect stub at /2024/09/20/how-to-generate-an-sbom-from-a-container/ resolves to /guides/docker/
• Old post URL is out of the sitemap; /guides/docker/ remains
• /resources/ emits noindex, follow; other pages still emit index, follow
• No remaining internal links to the removed post
• d2 lint not run: not installed in this environment, and no .d2 files are touched

🤖 Generated with Claude Code

https://claude.ai/code/session_01Eb2uMFkkbVviAV9PBVikPj