Add security analysis with zizmor #601

Job	Run time
sync / sync	1m 27s
sync / commit	25s
check / Build docs (latex)	9m 16s
check / Lint translations	55s
check / Build docs (epub)	8m 44s
check / Build docs (html)	9m 13s
check / Check for zero-width space characters	35s
check / Build docs (pdf)	11m 27s
	42m 2s

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