chore(blog): add images frontmatter for social preview on existing posts

[tym83]

Summary

Populates the images: frontmatter field for all existing blog posts that have at least one image, so Open Graph / Twitter Card previews on Telegram, Facebook, LinkedIn, and Slack show a post-specific image instead of the site-default cover.

What

• 38 posts updated across content/en/blog/:
  • Page bundles (directory with index.md + local images): first raster file picked by natural sort, e.g. 001_marketplace.png, image1.png, devstats.png.
  • Plain .md posts (e.g. Medium imports): first external image URL from the body, e.g. https://cdn-images-1.medium.com/max/800/....
• SVG-only page bundles are intentionally left untouched (the 3 DIY "create your own cloud" posts). Facebook, Twitter, and Telegram do not render SVG in OG previews; leaving images: unset falls back to the site-level default img/cozystack-social.png from hugo.yaml, which is a working preview.
• No layout changes. Hugo's internal opengraph.html / twitter_cards.html partials already consume .Params.images out of the box — this PR just feeds them with per-post values.

Why

Until now, every blog post shared on social platforms rendered with the same site-default image. For release posts, how-tos, and technical deep-dives this is a missed opportunity: a post-specific preview image drives noticeably higher CTR on Telegram/LinkedIn and makes timelines scannable.

Going forward, new posts with images will include images: in frontmatter as a standard convention.

Preview

After merge, hit the OG debuggers on a couple of permalinks to bust caches on each platform:

• Facebook Sharing Debugger — https://developers.facebook.com/tools/debug/
• LinkedIn Post Inspector — https://www.linkedin.com/post-inspector/
• Telegram @WebpageBot — send the URL to force re-scrape

Summary by CodeRabbit

• Documentation
  • Added structured image metadata to blog post front-matter across all published articles for improved image handling and rendering.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1176fdc7-36ba-43da-804b-93ed503b6fa2

📥 Commits

Reviewing files that changed from the base of the PR and between 6f507de and e4c9c54.

📒 Files selected for processing (38)

• content/en/blog/2020-05-14-configuring-routing-for-metallb-in-l2-mode.md
• content/en/blog/2024-02-21-introducing-cozystack-a-free-paas-platform-based-on-kubernetes.md
• content/en/blog/2024-08-15-cozystack-v0-11.md
• content/en/blog/2024-08-16-installing-a-kubernetes-cluster-managed-by-cozystack-a-detailed-guide-by-gohost-and-nix.md
• content/en/blog/2024-09-25-cozystack-has-officially-been-included-in-the-cncf-landscape.md
• content/en/blog/2024-09-26-recent-changes-in-the-cozystack-open-source-platform-opencost-log-collection-system-bridge.md
• content/en/blog/2024-10-03-the-open-source-platform-cozystack-version-0-16-0.md
• content/en/blog/2024-10-04-cozystack-on-hacktoberfest-become-a-part-of-the-global-it-event.md
• content/en/blog/2024-10-24-what-s-new-in-cozystack-v0-17.md
• content/en/blog/2024-11-07-cozystack-v0-18.md
• content/en/blog/2024-12-12-cozystack-v0-20-release-terraform-keycloak-and-stability-security-improvements.md
• content/en/blog/2024-12-12-how-we-built-a-dynamic-kubernetes-api-server-for-the-api-aggregation-layer-in-cozystack.md
• content/en/blog/2024-12-28-introducing-the-pre-new-year-release-of-open-source-platform-cozystack-v0-21.md
• content/en/blog/2025-01-17-cozystack-v0-22-release-telemetry-patched-talos-v1-9-1-new-entities-workload-workloadmonitor.md
• content/en/blog/2025-03-13-cozystack-becomes-a-cncf-sandbox-project.md
• content/en/blog/2025-04-10-updates-to-the-open-source-platform-cozystack-0-24-0-29.md
• content/en/blog/2025-04-18-cozystack-now-offers-gpu-passthrough-for-ai-ml-virtual-machines.md
• content/en/blog/2025-04-28-a-simple-way-to-install-talos-linux-on-any-machine-with-any-provider.md
• content/en/blog/2025-05-21-cozystack-recognized-in-cncf-s-cnai-landscape.md
• content/en/blog/2025-06-04-the-evolution-of-virtualization-platforms-the-rise-of-managed-services-and-local-providers-edge.md
• content/en/blog/2025-06-06-cozystack-became-a-certified-kubernetes-platform.md
• content/en/blog/2025-06-18-cozyhr-how-we-simplified-local-development-with-helm-and-flux.md
• content/en/blog/2025-07-09-cozystack-v0-31-0-33.md
• content/en/blog/2025-08-04-cozystack-v0-34.md
• content/en/blog/2025-08-14-invitation-to-cozysummit-virtual-december-3.md
• content/en/blog/2025-08-21-cozystack-v0-35.md
• content/en/blog/2025-09-03-cncf-webinar-one-api-to-rule-them-all-building-a-unified-platform-with-kubernetes-aggregation.md
• content/en/blog/2025-09-10-protofire-experience-operating-kubernetes-with-cozystack.md
• content/en/blog/2025-10-01-cozystack-v0-36.md
• content/en/blog/2025-10-08-cozystack-applied-to-cncf-incubated.md
• content/en/blog/2025-10-14-cozysummit-lineup-is-out.md
• content/en/blog/2025-12-12-flux-aio-kubernetes-mtls-and-the-chicken-and-egg-problem/index.md
• content/en/blog/2025-12-17-talm-v0-17-built-in-age-encryption-for-secrets.md
• content/en/blog/2026-04-06-cozysummit-virtual-2026-the-program-is-set/index.md
• content/en/blog/2026-04-08-cozystack-oss-health-section/index.md
• content/en/blog/2026-04-17-managed-postgresql-synchronous-replication/index.md
• content/en/blog/cozystack-1-0-release/index.md
• content/en/blog/game-servers-on-cozystack-no-april-fools-joke/index.md

---

📝 Walkthrough

Walkthrough

Across 36 blog post files, an images front-matter field was added containing image URLs or filenames. This metadata addition enables structured image references at the page level for rendering and indexing, without modifying article content, logic, or control flow.

Changes

Cohort / File(s)

Summary

Blog Posts Image Metadata content/en/blog/2020-05-14-*.md, content/en/blog/2024-02-21-*.md, content/en/blog/2024-08-15-*.md, content/en/blog/2024-08-16-*.md, content/en/blog/2024-09-25-*.md, content/en/blog/2024-09-26-*.md, content/en/blog/2024-10-03-*.md, content/en/blog/2024-10-04-*.md, content/en/blog/2024-10-24-*.md, content/en/blog/2024-11-07-*.md, content/en/blog/2024-12-12-*.md (x2), content/en/blog/2024-12-28-*.md, content/en/blog/2025-01-17-*.md, content/en/blog/2025-03-13-*.md, content/en/blog/2025-04-10-*.md, content/en/blog/2025-04-18-*.md, content/en/blog/2025-04-28-*.md, content/en/blog/2025-05-21-*.md, content/en/blog/2025-06-04-*.md, content/en/blog/2025-06-06-*.md, content/en/blog/2025-06-18-*.md, content/en/blog/2025-07-09-*.md, content/en/blog/2025-08-04-*.md, content/en/blog/2025-08-14-*.md, content/en/blog/2025-08-21-*.md, content/en/blog/2025-09-03-*.md, content/en/blog/2025-09-10-*.md, content/en/blog/2025-10-01-*.md, content/en/blog/2025-10-08-*.md, content/en/blog/2025-10-14-*.md, content/en/blog/2025-12-12-*/index.md, content/en/blog/2025-12-17-*.md, content/en/blog/2026-04-06-*/index.md, content/en/blog/2026-04-08-*/index.md, content/en/blog/2026-04-17-*/index.md, content/en/blog/cozystack-1-0-release/index.md, content/en/blog/game-servers-on-cozystack-no-april-fools-joke/index.md

Added images front-matter field containing a single image URL or filename to each blog post. No content, logic, or body text modifications.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐰 A hop through the metadata, swift and bright,
Thirty-six images now tagged just right,
Blog posts adorned with frontmatter care,
Visual treasures indexed everywhere!
The rabbit grins—structured data's delight! 📸

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/blog-social-images-frontmatter

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[gemini-code-assist]

Code Review

This pull request adds an "images" field to the frontmatter of numerous blog post files in the "content/en/blog/" directory. Each entry specifies a URL or local path to a representative image for the post, likely to improve social media previews and SEO. The changes are consistent across all modified files, and I have no feedback to provide.