github action `testdata` might have a issue.

[Gekko0114]

What happened: There might be several issues. 1 testdata action might not fail because there is no command checking if the PR includes all wasm files, like git diff --exit-code. 2 However, introducing a command like git diff --exit-code might lead to a new problem. wasm files seem to depend on developer's environment. For example, I am using mac environment. Even though I don't change any codes, wasm file I build is different from the file attached in the github repo. If we implement a command like git diff --exit-code, we might need to standardize the development environment.

Please let me know if I misunderstand something.

(Previously I talked this issue with @kazukousen)

What you expected to happen:

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

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Environment: github_actions