SetExitCode sets the exit code to 1 if the error is not a context.Canceled error.

SetExitCode sets the exit code to 1 if the error is not a context.Canceled error.

SetupExitHandler: A context is returned which is canceled on receiving a shutdown signal (SIGTERM or SIGINT).

AlwaysErrCode indicates the exit code of the program should always be nonzero and should correspond to the numeric value of the signal that was received.

GracefulShutdown treats a shutdown signal as a request to exit gracefully, terminating goroutines and returning an exit code of 0 if there are no errors during shutdown.

ExitBehavior controls how the program should be terminated in response to a shutdown signal.