add build.sh #12

Job	Run time
generate_matrix	1m 14s
update_flake	51s
check_flake	4m 13s
build_images (x86_64, linux, server, proxmox)	32m 9s
build_images (x86_64, linux, server, raw-efi)	16m 15s
build_images (x86_64, linux, server, iso)	1h 3m 55s
build_images (x86_64, linux, bri, proxmox)	31m 57s
build_images (x86_64, linux, bri, raw-efi)	4m 26s
build_images (x86_64, linux, bri, iso)	38m 45s
build_flake (cb)	1m 23s
build_flake (pyEnv)	1m 52s
build_flake (sysdo)	1m 36s
push_update	0s
	3h 18m 36s

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