部署Docker化Fast API至Google App Engine后遇502网关错误

尝试将基于Docker的API部署至Google App Engine，但部署完成后出现502 Bad Gateway错误。以下是相关配置文件：

docker-compose.yaml #

version: '3'

services:
  web:
    build: .
    # command: sh -c "uvicorn initialfile:app --host=0.0.0.0 --port=7005 --reload"
    ports:
      - 8000:8000
    volumes:
      - .:/app

docker-compose-deploy.yml #

version: '3.9'

services:
  gcloud:
    image: google/cloud-sdk:latest
    volumes:
      - gcp-creds:/creds
      - .:/app
    working_dir: /app
    environment:
      - CLOUDSDK_CONFIG=/creds

volumes:
  gcp-creds:

app.yaml #

runtime: python39
instance_class: F4_1G

Dockerfile #

FROM python:3.11.5-bookworm

WORKDIR /app

COPY . /app

RUN pip install -r requirements.txt

EXPOSE 8000

CMD ["uvicorn","initialfile:app","--host","0.0.0.0","--port","8000"]

内容的提问来源于stack exchange，提问作者vijabhishek70