## Summary
- Add `isGitHubActions` environment variable check to conditionally
disable Windows code signing
- Disable `windowsSign` in `packagerConfig` when running on GitHub
Actions
- Pass empty config to `MakerSquirrel` instead of signing config on
GitHub Actions

## Test plan
- Verify the build succeeds on GitHub Actions without Windows signing
errors
- Verify local builds with Windows signing still work when not on GitHub
Actions

#skip-bugbot

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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<!-- This is an auto-generated description by cubic. -->
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## Summary by cubic
Enable Windows code signing on GitHub Actions and skip it for local
builds. Added an isGitHubActions env check to set
packagerConfig.windowsSign and pass windowsSign to MakerSquirrel only
when running in CI.

<sup>Written for commit 259bc98373fa92668745c503eecc6413528d1172.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>