track: use-actions-exec-20260329

[amondnet]

Replace execSync with @actions/exec

Track: use-actions-exec-20260329

Overview

Replace the execSync call from node:child_process in src/index.ts with @actions/exec from the GitHub Actions toolkit. This aligns all command execution in the codebase to use the same library, improving consistency and leveraging the toolkit's built-in logging and error handling.

Scope

• Replace execSync('git log -1 --pretty=format:%B') in getGitCommitMessage() with async @actions/exec.getExecOutput()
• Convert getGitCommitMessage() from sync to async
• Remove import { execSync } from 'node:child_process' from src/index.ts
• Update all callers of getGitCommitMessage() to await the result

Success Criteria

• SC-1: No node:child_process imports remain in production source code
• SC-2: All existing tests pass without modification (or with minimal test updates for async signature)
• SC-3: getGitCommitMessage() produces identical output as before
• SC-4: Error handling preserves the same error message format

Constraints

• No external behavior change — deployment output, PR comments, and error messages must remain identical
• @actions/exec is already a dependency; no new dependencies required

Out of Scope

• Refactoring exec patterns in src/vercel-cli.ts (already uses @actions/exec)
• Adding new features or changing command execution logic
• Modifying the Vercel CLI invocation patterns

[amondnet]

Implementation Complete

PR #318 — Ready for Review

Summary

All command execution in the codebase now uses @actions/exec consistently. Replaced execSync from node:child_process in getGitCommitMessage() with @actions/exec.getExecOutput(). No behavior change — all 117 tests pass.