feat(docs): forward DOCS_SITE_URL through Dockerfile build args

[yannickmonney]

Summary

Follow-up to #1684. prerender.ts and build-llms-artifacts.ts both already read process.env.DOCS_SITE_URL to compose canonical URLs, og:url, sitemap entries, and the absolute URLs in llms.txt / llms-full.txt. But the value wasn't plumbed through the Dockerfile, so every production build silently fell back to the hardcoded https://docs.tale.dev default — the only knob the host had over canonical URLs was editing the source.

Change

• services/docs/Dockerfile — add ARG DOCS_SITE_URL and ENV DOCS_SITE_URL=... next to the existing DOCS_BASE_URL plumbing.
• compose.docs.yml — forward DOCS_SITE_URL from the host env to the build args.

The default https://docs.tale.dev keeps the canonical docs.tale.dev deployment unchanged.

Pre-PR checklist

• Ran bun run check — N/A (Dockerfile + compose only, no JS/TS touched).
• Updated services/platform/messages/{en,de,fr}.json — N/A.
• Updated /docs/{en,de,fr}/ — N/A.
• Ran bun run --filter @tale/docs lint/test — N/A (no source changes).
• Updated README.md and translations — N/A.

Test plan

• DOCS_SITE_URL=https://tale.dev/docs DOCS_BASE_URL=/docs/ docker compose -f compose.docs.yml build → built HTML in /dist/index.html should have <link rel="canonical" href="https://tale.dev/docs/" /> and matching og:url.
• Default build (no env) still produces <link rel="canonical" href="https://docs.tale.dev/" />.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: eb305e73-2a80-45f7-b420-e4723d6afb47

📥 Commits

Reviewing files that changed from the base of the PR and between 9d9ec26 and 9535b1f.

📒 Files selected for processing (2)

• compose.docs.yml
• services/docs/Dockerfile

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/docs-site-url

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