Add upgrade-recovery subcommand #2820

Job	Run time
detect	1s
build-toolkit	1m 45s
build-matrix (green) / build-os	2m 59s
build-matrix (green) / detect	8s
build-matrix (green) / build-iso	1m 32s
build-matrix (green) / build-disk	1m 54s
build-matrix (green) / test-installer	11m 53s
build-matrix (green) / tests-matrix (test-upgrade)	15m 3s
build-matrix (green) / tests-matrix (test-downgrade)	10m 58s
build-matrix (green) / tests-matrix (test-recovery)	43m 4s
build-matrix (green) / tests-matrix (test-fallback)	14m 51s
build-matrix (green) / tests-matrix (test-fsck)	13m 54s
build-matrix (green) / tests-matrix (test-grubfallback)	12m 44s
	2h 10m 46s

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