rsync update times #59

Job	Run time
update_flake	50s
generate_matrix	1m 12s
check_flake	3m 54s
build_images (x86_64, linux, server, proxmox)	16m 12s
build_images (x86_64, linux, server, raw-efi)	15m 35s
build_images (x86_64, linux, server, iso)	39m 52s
build_images (x86_64, linux, bri, proxmox)	4m 51s
build_images (x86_64, linux, bri, raw-efi)	4m 42s
build_images (x86_64, linux, bri, iso)	38m 47s
build_flake (cb)	1m 29s
build_flake (pyEnv)	1m 1s
build_flake (sysdo)	1m 5s
push_update	0s
	2h 9m 30s

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