在Docker上运行时会产生恐怖

我有一个基本的Flask web应用程序,我想在Docker容器中设置它。以下是我的Dockerfile设置:

FROM python:3.8-alpine

WORKDIR /mydir

COPY requirements.txt requirements.txt
RUN pip3 install -r requirements.txt

COPY . .
ENV FLASK_APP="app.py"

CMD [ "python3", "-m" , "flask", "run", "--host=0.0.0.0", "-p", "8080"]

使用创建docker文件

mydir % docker build -t geode:latest .      

但当我试图通过Docker运行web应用程序时,会发生以下情况:

mydir % docker run -p 8080:8080 geode:latest
 * Serving Flask app 'app.py' (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
Usage: python -m flask run [OPTIONS]
Try 'python -m flask run --help' for help.

Error: While importing 'app', an ImportError was raised.

但是,我可以在本地运行web应用程序,方法如下

mydir % python3 -m flask run --host=0.0.0.0 -p 8080

所以我不知道为什么我在通过docker运行时会收到“ImportTerror”,但在我自己运行命令时却不会。