Ubuntu: Build and push ubuntu-toolbox images

Replace `/usr/local/sbin/unminimize` with `unminimize` in apt #96

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Run time

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Job	Run time
build-push-images (16.04)	7m 0s
build-push-images (18.04)	9m 45s
build-push-images (20.04)	9m 42s
build-push-images (22.04)	7m 48s
build-push-images (23.10)	18m 52s
build-push-images (24.04)	27m 31s
	1h 20m 38s