add git to docker #333

Job	Run time
image (x86_64, base/base-disk)	18m 56s
live-iso (x86_64, flagship/flagship-live)	22m 13s
image (x86_64, flagship/base-disk)	22m 9s
live-iso (x86_64, gnome/gnome-live)	20m 34s
image (x86_64, gnome/base-disk)	22m 10s
image (x86_64, kde/base-disk)	22m 10s
live-iso (x86_64, kde/kde-live)	1s
live-iso (x86_64, xfce/xfce-live)	22m 9s
image (x86_64, xfce/base-disk)	22m 9s
live-iso (aarch64, flagship/flagship-live)	22m 5s
image (aarch64, base/base-disk)	22m 6s
live-iso (aarch64, gnome/gnome-live)	22m 8s
image (aarch64, flagship/base-disk)	22m 11s
live-iso (aarch64, kde/kde-live)	22m 5s
image (aarch64, gnome/base-disk)	22m 10s
live-iso (aarch64, xfce/xfce-live)	22m 5s
image (aarch64, kde/base-disk)	22m 12s
image (aarch64, xfce/base-disk)	22m 9s
push-image	1s
	6h 11m 43s

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