Makefile CI (Test customfetch)

misc: update comments + add syntax examples in -l #1049

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Run time

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Job	Run time
build_Arch-AUR	1m 18s
build-macos	1m 14s
build-ubuntu-22_04-GUI	2m 41s
build-deb-gui	6m 35s
build_Arch	1m 14s
build-deb	4m 22s
build-ubuntu_22-04	3m 56s
	21m 20s