better filenames #44

Job	Run time
generate_matrix	1m 42s
update_flake	51s
check_flake	3m 52s
build_images (x86_64, linux, server, proxmox)	15m 39s
build_images (x86_64, linux, server, raw-efi)	16m 55s
build_images (x86_64, linux, server, iso)	42m 57s
build_images (x86_64, linux, bri, proxmox)	4m 49s
build_images (x86_64, linux, bri, raw-efi)	4m 1s
build_images (x86_64, linux, bri, iso)	39m 7s
build_flake (cb)	58s
build_flake (pyEnv)	1m 43s
build_flake (sysdo)	1m 1s
push_update	0s
	2h 13m 35s

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