add fastapi endpoint + deps + update dockerfile to run service instead

crawler/api/app.py

@@ -0,0 +1,14 @@
+from fastapi import FastAPI
+from repositories.listing_repository import ListingRepository
+from repositories.listing_repository import ListingRepository
+from database import engine
+
+
+app = FastAPI()
+
+
+@app.get("/listing")
+async def get_listing():
+    repository = ListingRepository(engine)
+    listings = await repository.get_listings()
+    return {"listings": listings}