Set up deployment environment for 2.0.0 alpha version

[sungik-choi]

Self Checklist

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Related Issue

None

Summary

2.0.0 alpha 버전을 위한 배포 환경을 설정합니다.

Details

• enter prerelease mode (alpha)
• ci branch rule에 alpha branch 추가

Breaking change or not (Yes/No)

No

References

• https://github.com/changesets/changesets/blob/main/docs/prereleases.md

[changeset-bot]

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Latest commit: a78214c

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