Merge pull request #120 from crazy-max/update-qemu #492

Job	Run time
prepare (mainline)	8m 43s
prepare (buildkit)	9m 51s
test (mainline)	4m 31s
test (buildkit)	34s
validate (./hack/lint)	44s
e2e (pip-youtube-dl, linux/arm/v7)	1m 34s
validate (./hack/validate-vendor)	29s
e2e (webpack, linux/arm/v7)	2m 48s
validate (./hack/install-and-test)	55s
e2e (ejabberd, linux/arm64)	24m 7s
build (mainline)	43m 33s
build (buildkit)	45m 17s
	2h 23m 6s

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