Need support to diff with previous commit

[fibonacci998]

Please describe your suggestion: 提案の概要

Currently, this action is check diff between current commit with main branch

Describe the solution you'd like: 考えうる解決方法

Support to check diff with previous commit like that

// to check diff between current commit with previous commit
git diff HEAD^ HEAD

Describe alternatives you've considered: 考えうる代替案

Additional context: 補足

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