fix: mksquashfs copied incorrectly #157

Job	Run time
generate-matrix	1s
Build PR (linux/386, core, xenial, false)	48s
Build PR (linux/amd64, core, xenial, false)	41s
Build PR (linux/arm/v7, core, xenial, false)	52s
Build PR (linux/arm64, core, xenial, false)	46s
Build PR (linux/ppc64le, core, xenial, false)	50s
Build PR (linux/386, core18, bionic, false)	45s
Build PR (linux/amd64, core18, bionic, false)	47s
Build PR (linux/arm/v7, core18, bionic, false)	46s
Build PR (linux/arm64, core18, bionic, false)	45s
Build PR (linux/ppc64le, core18, bionic, false)	49s
Build PR (linux/amd64, core20, focal, false)	45s
Build PR (linux/arm/v7, core20, focal, false)	51s
Build PR (linux/arm64, core20, focal, false)	54s
Build PR (linux/ppc64le, core20, focal, false)	49s
Build PR (linux/amd64, core22, jammy, false)	44s
Build PR (linux/arm/v7, core22, jammy, false)	49s
Build PR (linux/arm64, core22, jammy, false)	45s
Build PR (linux/ppc64le, core22, jammy, false)	52s
Test Build Snap with Docker	0s
Test Set Channel with Podman	0s
Test Build Snap with Podman	0s
Test Failures with Docker (expected)	0s
Test Failures with Podman (expected)	0s
Test Set Channel with Docker	0s
	14m 19s

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