Ubuntu: Build and push ubuntu-toolbox images

Ubuntu workflow: Disable 16.04 and 18.04 builds, do not fail early #102

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Run time

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Job	Run time
build-push-images (20.04)	9m 57s
build-push-images (22.04)	7m 41s
build-push-images (24.04)	25m 41s
build-push-images (24.10)	27m 18s
	1h 10m 37s