feat: implement blog project with CI pipeline

app/main.py

@@ -1,20 +1,21 @@
 from contextlib import asynccontextmanager
+from typing import AsyncGenerator
 
 import uvicorn
 from fastapi import FastAPI
 
 
 @asynccontextmanager
-async def lifespan(app: FastAPI):
+async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
     yield
 
 
-def app_factory():
+def app_factory() -> FastAPI:
     app = FastAPI(lifespan=lifespan)
     return app
 
 
-def main():
+def main() -> None:
     uvicorn.run(app_factory, factory=True, host="0.0.0.0", port=8000)