Snap

debian: drop to -O2 #5002

Job	Run time
arches	1s
mir-libs (amd64)	18m 25s
mir-libs (armhf)	27m 43s
mir-libs (arm64)	30m 33s
snap (canonical/mir-test-tools, amd64)	1m 56s
snap (canonical/mir-test-tools, armhf)	28m 48s
snap (canonical/mir-test-tools, arm64)	31m 44s
snap (canonical/confined-shell-wip, amd64)	7m 20s
snap (canonical/confined-shell-wip, armhf)	15m 57s
snap (canonical/confined-shell-wip, arm64)	17m 26s
snap (canonical/ubuntu-frame, amd64)	7m 5s
snap (canonical/ubuntu-frame, armhf)	16m 11s
snap (canonical/ubuntu-frame, arm64)	17m 32s
snap (Miriway/Miriway, amd64)	9m 16s
snap (Miriway/Miriway, armhf)	15m 59s
snap (Miriway/Miriway, arm64)	17m 48s
	4h 23m 44s

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