ci: Let the Vercel ignore step fetch master despite the missing origin remote

[ntucker]

Requested by Nathaniel · project thread

Before: Vercel's build clone has no origin remote (found in #4205), so every git fetch … origin … in website/scripts/vercel-ignore.sh failed silently. Previews whose fork point was past the ~10-commit clone ended in build — no base to compare, so PRs that don't touch the site still got preview builds.

After: the script adds origin as https://github.com/$VERCEL_GIT_REPO_OWNER/$VERCEL_GIT_REPO_SLUG.git when it's missing, so the master fetch and deepen() work and the existing fetch lines stay as they were.

How: one guarded git remote add after the cd to the repo root (the clone is throwaway). The shallow-clone test cases now remove origin like Vercel does and map the GitHub URL to the local fixture with url.<base>.insteadOf; they fail without the fix and pass with it.

Verification on Vercel: this PR's preview log should show vercel-ignore: build — preview changes vs master (base …): website/scripts/vercel-ignore.sh instead of no base to compare.

🤖 Generated with Claude Code

https://claude.ai/code/session_01KqTAWD4QnKLcbMukj2phKQ

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Generated by Claude Code

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Note

Low Risk
Changes only the Vercel docs skip/build gate; behavior still fails open to build when git history is unavailable.

Overview
Fixes preview builds firing on PRs that don't touch the docs site when Vercel's shallow clone has no origin remote, which caused all git fetch … origin … calls (including deepen()) to fail and the script to fall through to build — no base to compare.

After cd to the repo root, the script now adds origin as https://github.com/$VERCEL_GIT_REPO_OWNER/$VERCEL_GIT_REPO_SLUG.git when it's missing and those env vars are set, so existing master-fetch logic works without changing fetch commands.

Tests for shallow clones remove origin like Vercel, set VERCEL_GIT_*, and use url.<local>.insteadOf so fetches hit the fixture repo; they exercise skip vs build when the fork is far behind master.

^{Reviewed by Cursor Bugbot for commit 0170eb8. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
docs-site	Ready	Preview	Oct 5, 2026 11:16pm UTC

[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-05T23:18:02.758974Z	0170eb8	Draft marked ready

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