CI tests

Make pod the default reader for .pod/.pl/.pm #70

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Run time

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Job	Run time
linux-stack	1m 43s
linux (8.10, latest)	4m 39s
linux-nix-cabal	2m 46s
linux (9.0, latest)	4m 46s
windows	4m 35s
linux (9.2, latest)	4m 32s
linux (9.4, latest)	3m 16s
linux (9.6, latest)	3m 39s
	29m 56s