Docker tag "cosmossdk/simd-env" may not be good.

[ulbqb]

Summary of Bug

This docker tag is likely to cause a conflict with cosmossdk.
https://github.com/line/lbm-sdk/blob/ac918acc77d77d934e4dff134dcc53b9f83e3370/contrib/images/Makefile#L4

Version

ac918ac

Steps to Reproduce

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned