feat variables api

[atharvadeosthale]

No description provided.

[greptile-apps]

Greptile Summary

This PR adds the Variables API documentation: a new blog post, changelog entry, project-level environment variables doc page, expanded function and site env-vars pages, a new functions-env-vars.md partial, and the associated screenshots.

• The blog post and the changelog entry both reference cover: /images/blog/announcing-variables-api/cover.png, but this image file was not included in the PR and does not exist under static/. Every other announcement post ships its cover image in the same PR — without it both pages will render a broken image on publish.

Confidence Score: 4/5

Safe to merge after adding the missing cover image asset; all documentation content and SDK examples are otherwise consistent.

One P1 finding: the cover image referenced by both the blog post and the changelog is absent from the repository, causing a broken image on two public pages at publish time. No logic or security issues were found in the documentation content itself.

src/routes/blog/post/announcing-variables-api/+page.markdoc and src/routes/changelog/(entries)/2026-04-28.markdoc — both reference a missing static asset.

Important Files Changed

Filename	Overview
src/routes/blog/post/announcing-variables-api/+page.markdoc	New blog post for the Variables API announcement; references a cover image that is absent from the repository.
src/routes/changelog/(entries)/2026-04-28.markdoc	New changelog entry for 2026-04-28; references the missing cover image; scope names are consistent with the rest of the PR.
src/routes/docs/advanced/platform/environment-variables/+page.markdoc	New project-level env-vars doc page with full SDK multi-language examples; uses newly added platform screenshots and correct scope names.
src/routes/docs/products/functions/environment-variables/+page.markdoc	Expanded functions env-vars doc with SDK CRUD examples; previous reviewer flagged a missing import os in the Python Read variables snippet.
src/routes/docs/products/sites/environment-variables/+page.markdoc	New sites env-vars doc page; images reference existing static assets and SDK examples look consistent.

_{Reviews (3): Last reviewed commit: "fix ids" | Re-trigger Greptile}

[greptile-apps]

Missing blog cover image

The cover field references /images/blog/announcing-variables-api/cover.png, but no such file was added in this PR and it does not exist under static/images/blog/. Every other announcement post (e.g. announcing-webhooks-api, announcing-bulk-api) ships the cover image as part of the same PR. Without it, the blog post and the changelog entry will both render a broken image.