Backwards compatible recovery boot configuration #3003

Job	Run time
detect	1s
build-toolkit	1m 55s
build-matrix (green) / build-os	3m 28s
build-matrix (green) / detect	9s
build-matrix (green) / build-disk	3m 21s
build-matrix (green) / build-iso	2m 54s
build-matrix (green) / test-installer	4m 37s
build-matrix (green) / tests-matrix (test-upgrade)	3m 20s
build-matrix (green) / tests-matrix (test-downgrade)	5m 0s
build-matrix (green) / tests-matrix (test-recovery)	9m 42s
build-matrix (green) / tests-matrix (test-fallback)	9m 34s
build-matrix (green) / tests-matrix (test-fsck)	4m 49s
build-matrix (green) / tests-matrix (test-grubfallback)	4m 8s
	52m 58s

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