update gitignore #16

Job	Run time
update_flake	55s
generate_matrix	1m 3s
check_flake	3m 52s
build_images (x86_64, linux, server, proxmox)	15m 39s
build_images (x86_64, linux, server, raw-efi)	16m 8s
build_images (x86_64, linux, server, iso)	38m 42s
build_images (x86_64, linux, bri, proxmox)	4m 0s
build_images (x86_64, linux, bri, raw-efi)	4m 37s
build_images (x86_64, linux, bri, iso)	33m 47s
build_flake (cb)	59s
build_flake (pyEnv)	1m 4s
build_flake (sysdo)	1m 48s
push_update	0s
	2h 2m 34s

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