Add orange flavor btrfs support #3418

Job	Run time
detect	2s
build-toolkit	1m 16s
build-matrix (orange) / build-os	2m 58s
build-matrix (orange) / detect	1s
build-matrix (blue) / detect	1s
build-matrix (blue) / build-os	2m 45s
build-matrix (green) / detect	1s
build-matrix (green) / build-os	2m 14s
build-matrix (green) / build-iso	1m 49s
build-matrix (green) / build-disk	2m 29s
build-matrix (blue) / build-iso	1m 52s
build-matrix (blue) / build-disk	2m 7s
build-matrix (orange) / build-disk	4m 20s
build-matrix (orange) / build-iso	2m 33s
build-matrix (green) / test-installer	3m 26s
build-matrix (blue) / test-installer	3m 30s
build-matrix (green) / tests-matrix (test-upgrade)	8m 18s
build-matrix (green) / tests-matrix (test-downgrade)	4m 49s
build-matrix (green) / tests-matrix (test-recovery)	5m 47s
build-matrix (green) / tests-matrix (test-fallback)	10m 26s
build-matrix (green) / tests-matrix (test-fsck)	4m 44s
build-matrix (green) / tests-matrix (test-grubfallback)	49m 44s
build-matrix (blue) / tests-matrix (test-active)	2m 34s
build-matrix (orange) / test-installer	4m 21s
build-matrix (orange) / tests-matrix (test-active)	3m 20s
	2h 5m 27s

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