Flask

app.py

from flask import Flask, render_template
import os

app = Flask(__name__)


@app.route('/')
def home():
    return render_template('index.html')


if __name__ == "__main__":
    port = int(os.environ.get('PORT', 5000))
    app.run(debug=True, host='0.0.0.0', port=port)

Dockerfile

FROM python:3.8-alpine

COPY ./requirements.txt /app/requirements.txt

WORKDIR /app
RUN pip install -r requirements.txt
# copy every content from the local file to the image
COPY . /app
# configure the container to run in an executed manner
ENTRYPOINT [ "python" ]
CMD ["app.py"]