Docker python:无法打开文件“/app/main.py”:[Erno 2]没有这样的文件或目录script_execution_service退出,代码为2

结构如下:

├── data_storage_service
│   ├── db
│   ├── Dockerfile
│   └── initial-db.sqlite
├── docker-compose.yml
└── script_execution_service
    ├── app
    ├── Dockerfile
    ├── main.py
    └── requirements.txt  

1) data_storage_service中的Dockerfile是:“

FROM alpine:latest

RUN apk --no-cache add sqlite

WORKDIR /db

COPY initial-db.sqlite /db/

CMD ["tail", "-f", "/dev/null"]

2. initial-db.sqlite仍然为空

3. docker-compose.yml如下所示:

version: '3.8'

services:
  data_storage_service:
    build:
      context: ./data_storage_service
    container_name: data_storage_service
    volumes:
      - ./data_storage_service/db:/db
  script_execution_service:
    build:
      context: ./script_execution_service
    container_name: script_execution_service
    depends_on:
      - data_storage_service
    volumes:
      - ./script_execution_service/app:/app
    environment:
      - DB_PATH=/db/initial-db.sqlite

4. script_execution_service中的Dockerfile:

FROM python:3.10

WORKDIR /app

COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY . .
CMD ["python", "main.py"]

5. main.py如下所示:

import os
import sqlite3

def fetch_data_from_db(db_path, table_name):
    conn = sqlite3.connect(db_path)
    cursor = conn.cursor()
    cursor.execute(f"SELECT * FROM {table_name}")
    rows = cursor.fetchall()
    conn.close()
    return rows

def main():
    db_path = os.environ.get('DB_PATH')
    ventes = fetch_data_from_db(db_path, 'ventes')
    print(ventes)

if __name__ == '__main__':
    main()

当我执行docker compose up时,我会出现以下错误:

script_execution_service  | python: can't open file '/app/main.py': [Errno 2] No such file or directory

有人能帮我吗,我是新手。谢谢