python flask项目打包成docker镜像发布的方法是什么

import json
from flask import Flask,request,render_template
app = Flask(__name__)
@app.route('/')
def index():
    return 'hello world'
@app.route('/sum',methods=['POST'])
def correct():
   a= request.json['a']
   b=request.json['b']
   sum=int(a)+int(b)
   print(sum)
   result={"sum:":sum}
   return result
 
if __name__ == '__main__':
    app.run(host="0.0.0.0",port=5000)

FROM python:3.7
 
COPY . /app/
 
RUN pip install -r /app/requirements.txt
 
WORKDIR /app
 
EXPOSE 5000
 
CMD [ "python","sum.py" ]