update build.sh #21

Job	Run time
generate_matrix	1m 2s
update_flake	55s
check_flake	3m 55s
build_images (x86_64, linux, server, proxmox)	31m 11s
build_images (x86_64, linux, server, raw-efi)	17m 18s
build_images (x86_64, linux, server, iso)	39m 52s
build_images (x86_64, linux, bri, proxmox)	4m 3s
build_images (x86_64, linux, bri, raw-efi)	3m 55s
build_images (x86_64, linux, bri, iso)	38m 56s
build_flake (cb)	1m 39s
build_flake (pyEnv)	1m 0s
build_flake (sysdo)	1m 46s
push_update	0s
	2h 25m 32s

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