fix(ci): skip Vercel preview deploys without token

[wcpos-bot]

Summary

• Check whether VERCEL_TOKEN is available without printing its value.
• Skip the Vercel pull, build, deploy, and preview-comment steps when the token is unavailable.
• Let Dependabot and fork PR checks finish without attempting an unauthenticated Vercel deployment.

Design decisions

• Use a step output for token availability so VERCEL_TOKEN is not exposed as a job-wide environment variable.
• Keep the existing preview job gate and only skip steps that depend on Vercel credentials.

Test plan

• Run actionlint .github/workflows/ci.yml.
• Verify the original workflow fails all five token-guard assertions and the updated workflow passes them.
• Run lint, type checking, 2,083 unit tests, and the production build.

Related

• Fixes the failing Deploy Preview check on chore(deps): bump the actions group across 1 directory with 3 updates #548.

[greptile-apps]

Greptile Summary

This PR skips Vercel preview operations when the deployment token is unavailable. The main changes are:

• Adds a step-scoped check for VERCEL_TOKEN availability.
• Gates preview pull, build, deploy, and comment steps on that check.
• Preserves the existing fork restriction for preview comments.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
.github/workflows/ci.yml	Adds a non-disclosing token check and consistently gates Vercel-dependent preview steps.

_{Reviews (1): Last reviewed commit: "fix(ci): skip Vercel preview without tok..." | Re-trigger Greptile}