Add push-images workflow #3370

Job	Run time
detect	1s
build-toolkit	1m 29s
build-matrix (green) / build-os	2m 23s
build-matrix (orange) / build-os	2m 26s
build-matrix (orange) / detect	1s
build-matrix (green) / detect	1s
build-matrix (blue) / build-os	2m 43s
build-matrix (blue) / detect	1s
build-matrix (green) / build-disk	3m 32s
build-matrix (green) / build-iso	1m 52s
build-matrix (orange) / build-disk	4m 29s
build-matrix (orange) / build-iso	2m 46s
build-matrix (green) / test-installer	3m 27s
build-matrix (blue) / build-iso	1m 46s
build-matrix (blue) / build-disk	3m 34s
build-matrix (green) / tests-matrix (test-upgrade)	8m 7s
build-matrix (green) / tests-matrix (test-downgrade)	5m 10s
build-matrix (green) / tests-matrix (test-recovery)	8m 8s
build-matrix (green) / tests-matrix (test-fallback)	11m 23s
build-matrix (green) / tests-matrix (test-fsck)	4m 33s
build-matrix (green) / tests-matrix (test-grubfallback)	4m 50s
build-matrix (orange) / test-installer	4m 44s
build-matrix (blue) / test-installer	3m 25s
build-matrix (orange) / tests-matrix (test-active)	3m 45s
build-matrix (blue) / tests-matrix (test-active)	2m 55s
	1h 27m 31s

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