ci: Preview workflow

[peaceiris]

Checklist

• [X] I am using the latest version of this action.
• [X] I have read the latest README and followed the instructions.
• [X] I have read the latest GitHub Actions official documentation and learned the basic spec and concepts.

Describe your proposal

Create a test flight on CI, not local envs with the make command.

Describe the solution you'd like

• Triggered by an issue/pull-request comment with /preview
• Build assets and Git push
• Create a comment with a Git commit hash
• Remove assets and Git push

Describe alternatives you've considered

n/a

Additional context

n/a

[ayamebot]

Hi, there.

Thank you @peaceiris for suggesting this.

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