feat: Gitpod docker image (#29) #348

Job	Run time
image (x86_64, base/base-disk)	20m 54s
live-iso (x86_64, flagship/flagship-live)	24m 2s
image (x86_64, flagship/base-disk)	35m 7s
image (x86_64, gnome/base-disk)	30m 4s
live-iso (x86_64, gnome/gnome-live)	22m 8s
image (x86_64, kde/base-disk)	38m 8s
live-iso (x86_64, kde/kde-live)	1s
image (x86_64, xfce/base-disk)	33m 47s
live-iso (x86_64, xfce/xfce-live)	23m 29s
image (aarch64, base/base-disk)	26m 44s
live-iso (aarch64, flagship/flagship-live)	37m 9s
image (aarch64, flagship/base-disk)	40m 22s
live-iso (aarch64, gnome/gnome-live)	29m 59s
image (aarch64, gnome/base-disk)	34m 15s
live-iso (aarch64, kde/kde-live)	39m 32s
image (aarch64, kde/base-disk)	38m 27s
live-iso (aarch64, xfce/xfce-live)	32m 55s
image (aarch64, xfce/base-disk)	36m 49s
push-image	1s
	9h 3m 53s

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