Add push-images workflow #3369

Job	Run time
detect	1s
build-toolkit	13s
build-matrix (blue) / build-os	18s
build-matrix (blue) / detect	1s
build-matrix (green) / detect	1s
build-matrix (green) / build-os	19s
build-matrix (orange) / build-os	26s
build-matrix (orange) / detect	1s
build-matrix (blue) / build-iso	20s
build-matrix (blue) / build-disk	10s
build-matrix (green) / build-iso	13s
build-matrix (green) / build-disk	9s
build-matrix (blue) / tests-matrix (test-active)	2m 52s
build-matrix (orange) / build-disk	13s
build-matrix (orange) / build-iso	24s
build-matrix (blue) / test-installer	3m 31s
build-matrix (green) / test-installer	3m 28s
build-matrix (green) / tests-matrix (test-upgrade)	8m 14s
build-matrix (green) / tests-matrix (test-downgrade)	4m 39s
build-matrix (green) / tests-matrix (test-recovery)	8m 9s
build-matrix (green) / tests-matrix (test-fallback)	9m 46s
build-matrix (green) / tests-matrix (test-fsck)	4m 36s
build-matrix (green) / tests-matrix (test-grubfallback)	4m 20s
build-matrix (orange) / tests-matrix (test-active)	3m 43s
build-matrix (orange) / test-installer	4m 43s
	1h 0m 50s

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