Action fails to report lint results on Windows (swift-format-official)

[compnerd]

When using this action on Windows, the lint action always succeeds, silently discarding the results. This was observed with the swift-format-official usage, but is likely the case for other tooling as well.

[compnerd]

The underling issue here is that run will use execSync which will invoke the tool in a subshell. However, the result of the subshell will not be propagated back due to being invoked in a sub-%COMSPEC% environment (https://nodejs.org/api/child_process.html#child_process_child_process_execsync_command_options).

The solution here is to perform a micro-optimization which will incidentally fix the issue - namely moving away from child_process.execSync. Using child_process.spawnSync is better as it can avoid the shell entire (we can still retain the ability to run a shell if needed, but I suspect it is not necessary). This avoids the need to create a new shell environment and run the subprocess.

[compnerd]

#218 should be able to demonstrate the test failures at least and hopefully prevent future regressions.

[github-actions]

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