panic when pull arm image

[sfeng1996]

What happen?

sealer report panic when pull the image on the server of arm architecture
error :

[root@wfw-arm-01 ~]# ./sealer pull registry.cn-qingdao.aliyuncs.com/sealer-io/kubernetes:v1.21.12
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x7ec610]

goroutine 1 [running]:
github.com/alibaba/sealer/utils/platform.cpuVariant.func1()
	/home/runner/work/sealer/sealer/src/github.com/alibaba/sealer/utils/platform/cpu.go:52 +0xc0
sync.(*Once).doSlow(0x2cd23c0, 0x1b88aa0)
	/opt/hostedtoolcache/go/1.16.15/x64/src/sync/once.go:68 +0x11c
sync.(*Once).Do(...)
	/opt/hostedtoolcache/go/1.16.15/x64/src/sync/once.go:59
github.com/alibaba/sealer/utils/platform.cpuVariant(0x0, 0x180dc60)
	/home/runner/work/sealer/sealer/src/github.com/alibaba/sealer/utils/platform/cpu.go:45 +0x74
github.com/alibaba/sealer/utils/platform.GetDefaultPlatform(...)
	/home/runner/work/sealer/sealer/src/github.com/alibaba/sealer/utils/platform/platform.go:128
github.com/alibaba/sealer/utils/platform.GetPlatform(0x0, 0x0, 0x1d99a18, 0x40007a25c0, 0x4000050055, 0x5, 0x40009b1d38)
	/home/runner/work/sealer/sealer/src/github.com/alibaba/sealer/utils/platform/platform.go:137 +0x28
github.com/alibaba/sealer/sealer/cmd.glob..func15(0x2c74320, 0x40007a23d0, 0x1, 0x1, 0x0, 0x0)
	/home/runner/work/sealer/sealer/src/github.com/alibaba/sealer/sealer/cmd/pull.go:39 +0x6c
github.com/spf13/cobra.(*Command).execute(0x2c74320, 0x40007a23b0, 0x1, 0x1, 0x2c74320, 0x40007a23b0)
	/home/runner/work/sealer/sealer/src/github.com/alibaba/sealer/vendor/github.com/spf13/cobra/command.go:852 +0x320
github.com/spf13/cobra.(*Command).ExecuteC(0x2c74aa0, 0x20, 0x6, 0x7)
	/home/runner/work/sealer/sealer/src/github.com/alibaba/sealer/vendor/github.com/spf13/cobra/command.go:960 +0x268
github.com/spf13/cobra.(*Command).Execute(...)
	/home/runner/work/sealer/sealer/src/github.com/alibaba/sealer/vendor/github.com/spf13/cobra/command.go:897
github.com/alibaba/sealer/sealer/cmd.Execute()
	/home/runner/work/sealer/sealer/src/github.com/alibaba/sealer/sealer/cmd/root.go:48 +0x30
main.main()
	/home/runner/work/sealer/sealer/src/github.com/alibaba/sealer/sealer/main.go:26 +0x30

Relevant log output?

No response

What you expected to happen?

No response

How to reproduce it (as minimally and precisely as possible)?

No response

Anything else we need to know?

No response

What is the version of Sealer you using?

{"gitVersion":"v0.8.5","gitCommit":"f9c3d99","buildDate":"2022-04-28 14:18:32","goVersion":"go1.16.15","compiler":"gc","platform":"linux/arm64"}

What is your OS environment?

NAME="Kylin Linux Advanced Server" VERSION="V10 (Tercel)" ID="kylin" VERSION_ID="V10" PRETTY_NAME="Kylin Linux Advanced Server V10 (Tercel)" ANSI_COLOR="0;31"

What is the Kernel version?

Linux wfw-arm-01.novalocal 4.19.90-21.7.ky10.aarch64 #1 SMP Thu Dec 17 16:31:09 CST 2020 aarch64 aarch64 aarch64 GNU/Linux

Other environment you want to tell us?

• Cloud provider or hardware configuration:
• Install tools:
• Others: