fix: include requirements.txt for docker build

Dockerfile

@@ -7,4 +7,4 @@ RUN pip install --no-cache-dir -r requirements.txt
 COPY . .
 
 EXPOSE 7860
-CMD ["python", "api.py"]
+CMD ["uvicorn", "api:app", "--host", "0.0.0.0", "--port", "7860"]

requirements.txt

@@ -0,0 +1,2 @@
+fastapi
+uvicorn[standard]