Improve runguard error message when command cannot be executed #3080
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When the system error is "Permission denied" this typically means that the full path of the command is not traversible for the user. This can happen for example when a validator is executed as `domjudge-run` user and `/home/domjudge` does not have `o+x` set. (cherry picked from commit aa67a2b)
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When the system error is "Permission denied" this typically means that the full path of the command is not traversible for the user. This can happen for example when a validator is executed as
domjudge-runuser and/home/domjudgedoes not haveo+xset.(cherry picked from commit aa67a2b)