Stop CI on first error

Trying to figure out why the errors to be fixed in !42 (merged) did not show via CI.

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• 80d388eb - Collect exit codes

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• a64ef9ba - Return exit code from run_script

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• e44dd241 - Test fix manpage

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• 5b54f494 - Revert "Test fix manpage"

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merged

mentioned in commit bebd2c54

mentioned in merge request !42 (merged)