The worker goroutines in `NewParallelExecutor` had no panic recovery. A panic in any executor (e.g. expression evaluation) would crash the entire runner process, leaving all steps stuck in the UI because the final status was never reported back.
Add `defer`/`recover` in the worker goroutines to convert panics into errors that propagate through the normal error channel.
Issue is present in latest `nektos/act` as well.
Fixes https://gitea.com/gitea/act_runner/issues/371
(Partially generated by Claude)
Reviewed-on: https://gitea.com/gitea/act/pulls/153
Reviewed-by: Lunny Xiao <[email protected]>
Co-authored-by: silverwind <[email protected]>
Co-committed-by: silverwind <[email protected]>
