Add `fileviewer` for browsing files via web server #13

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Run time

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Job	Run time
Go 1.22 on ubuntu-22.04	28s
Go 1.21 on ubuntu-22.04	26s
Go 1.20 on ubuntu-22.04	24s
Go 1.19 on ubuntu-22.04	18s
Go 1.18 on ubuntu-22.04	18s
	1m 54s