Git Server

### 🔖 Enhancement description

Sorry as I have not really used features like domains, sites, functions. But I have considered using sites, although I publish my code to my own git server, so it would be nice if I was able to grab projects from there.

### 🎤 Pitch

Avoid GitHub integrations and instead have a pull on a timer or by button, allowing for pulling repos from selfhosted/basic git servers.

### 👀 Have you spent some time to check if this issue has been raised before?

- [x] I checked and didn't find similar issue

### 🏢 Have you read the Code of Conduct?

- [x] I have read the [Code of Conduct](https://github.com/appwrite/.github/blob/main/CODE_OF_CONDUCT.md)