I’m trying to deploy a django application on heroku. I use docker and poetry. I have a problem because in the dockerfile I install poetry and install dependencies using poetry. Locally it works fine, but when I want to deploy on heroku, the dependencies are not installed. Only putting code like:

‘RUN pip install -r requirements.txt’ installs the dependencies on heroku (I created the requirements.txt file using poetry export).

Should I have two different Dockerfiles for dev and prod, where I will use poetry in one and pip install requirements in the other ? Or should I use multistaged Dockerfile or do you have any other suggestions ?

My Dockerfile with potery:

FROM python:3.11-alpine

WORKDIR /code

ENV PYTHONUNBUFFERED 1
ENV PATH "/root/.local/bin:$PATH"

RUN apk add --no-cache curl 
    && curl -sSL https://install.python-poetry.org | python3 - 
    && apk add --no-cache postgresql-dev musl-dev

COPY poetry.lock pyproject.toml /code/

RUN poetry install --no-root

COPY . /code/

RUN poetry install

heroku.yml:

build:
  docker:
    web: backend/Dockerfile

run:
  web: gunicorn core.wsgi:application --bind 0.0.0.0:$PORT