Btrfs snapshotter implementation #2786

Job	Run time
detect	1s
build-toolkit	2m 9s
build-matrix (green) / detect	11s
build-matrix (green) / build-os	3m 9s
build-matrix (green) / build-disk	3m 11s
build-matrix (green) / build-iso	1m 39s
build-matrix (green) / test-installer	18m 28s
build-matrix (green) / tests-matrix (test-upgrade)	12m 55s
build-matrix (green) / tests-matrix (test-downgrade)	39m 0s
build-matrix (green) / tests-matrix (test-recovery)	35m 4s
build-matrix (green) / tests-matrix (test-fallback)	16m 49s
build-matrix (green) / tests-matrix (test-fsck)	15m 43s
build-matrix (green) / tests-matrix (test-grubfallback)	22m 17s
	2h 50m 36s

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