Support automatic import of GitHub repositories as a knowledge base

[RedwindA]

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

I hope to be able to quickly ask some questions about GitHub repos through RAG, but now I have to manually convert the code in the repository to a supported format and manually update the new code. Therefore, it would be very convenient if Dify could import GitHub repos with one click, automatically update the new code version, and re-vectorize the changed code

2. Additional context or comments

No response

3. Can you help us with this feature?

• [ ] I am interested in contributing to this feature.