Snap

debian: drop to -O2 #5003

Job	Run time
arches	1s
mir-libs (amd64)	18m 5s
mir-libs (armhf)	29m 27s
mir-libs (arm64)	30m 12s
snap (canonical/mir-test-tools, amd64)	12m 36s
snap (canonical/mir-test-tools, armhf)	20m 21s
snap (canonical/mir-test-tools, arm64)	24m 6s
snap (canonical/confined-shell-wip, amd64)	7m 56s
snap (canonical/confined-shell-wip, armhf)	14m 29s
snap (canonical/confined-shell-wip, arm64)	15m 50s
snap (canonical/ubuntu-frame, amd64)	6m 10s
snap (canonical/ubuntu-frame, armhf)	15m 9s
snap (canonical/ubuntu-frame, arm64)	19m 6s
snap (Miriway/Miriway, amd64)	8m 25s
snap (Miriway/Miriway, armhf)	19m 28s
snap (Miriway/Miriway, arm64)	18m 15s
	4h 19m 36s

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