fix(exit-code): catch exit code

In some case, the program exit with error and exit code of zero. Change this to exit with non zero code each
time the list of error is not empty.

main.go

@@ -37,5 +37,9 @@ func main() {
 		fmt.Fprintf(os.Stderr, "[helm-sops] Error: %s\n", err)
 	}
 
+	if len(w.Errors) > 0 && w.ExitCode == 0 {
+		w.ExitCode = 1
+	}
+
 	os.Exit(w.ExitCode)
 }