我发现了我的DockerFile缺少一些代码。

FROM python:3.6.9

RUN wget https://s3.amazonaws.com/shopify-managemant-app/wkhtmltopdf-0.9.9-static-amd64.tar.bz2
RUN tar xvjf wkhtmltopdf-0.9.9-static-amd64.tar.bz2
RUN mv wkhtmltopdf-amd64 /usr/local/bin/wkhtmltopdf
RUN chmod +x /usr/local/bin/wkhtmltopdf

WORKDIR /usr/src/app
COPY requirements.txt ./
RUN pip install -r requirements.txt
COPY . .

EXPOSE 8000

CMD ["python", "manage.py", "runserver", "0.0.0.0:8000"]

现在图像运行正常

这个Dockerfile可以与django和最新版本的wkhtmltopdf（0.12.6-1）一起使用

# pull official base image
FROM python:3.9-buster

RUN apt-get update \
    && apt-get install -y \
        curl \
        libxrender1 \
        libjpeg62-turbo \
        fontconfig \
        libxtst6 \
        xfonts-75dpi \
        xfonts-base \
        xz-utils
RUN curl "https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6-1/wkhtmltox_0.12.6-1.buster_amd64.deb" -L -o "wkhtmltopdf.deb"

RUN dpkg -i wkhtmltopdf.de

# set work directory
WORKDIR /usr/src/app

# set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

# install dependencies
RUN pip install --upgrade pip
COPY ./requirements.txt .

RUN pip install -r requirements.txt

# copy project
COPY . .

EXPOSE 8000
CMD ["python", "manage.py", "runserver", "0.0.0.0:8000"]