Remove dockerfile temporarily (flagos-ai#1074)

### PR Category
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CICD

### PR Types
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Breaking Change

### PR Description
<!-- Describe what you’ve done -->
This update temporarily removes the Dockerfiles due to a recent refactor
of our codebase since version
[v1.0.0-alpha.0](https://github.com/flagos-ai/FlagScale/releases/tag/v1.0.0-alpha.0).
New Dockerfiles will be added shortly.

Author: aoyulong