Running headless google chrome to convert html to pdf in docker

Question

I'm trying to convert htmls to pdfs in a docker container. Dockerfile:

FROM python:3.8

# Adding trusting keys to apt for repositories
RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -

# Adding Google Chrome to the repositories
RUN sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list'

# Updating apt to see and install Google Chrome
RUN apt-get -y update

# Magic happens
RUN apt-get install -y google-chrome-stable

COPY /requirements.txt /app/requirements.txt

WORKDIR /app

RUN pip3 install -r requirements.txt

COPY . /app

CMD [ "python3", "app.py" ]

app.py

html_file_url="file:///html_file_name.html"
pdf_file_path="pdf_file_name.pdf"
commands = [
            "google-chrome",
            "--headless",
            "--disable-gpu",
            "--no-sandbox",
            "--print-to-pdf={}".format(pdf_file_path),
            html_file_url,
        ]
        subprocess.run(commands)

On running the docker file i'm getting:

[0404/112836.835631:ERROR:bus.cc(397)] Failed to connect to the bus: Failed to connect to socket /host/run/dbus/system_bus_socket: No such file or directory
[0404/112836.835729:WARNING:bluez_dbus_manager.cc(248)] Floss manager not present, cannot set Floss enable/disable.
[0404/112836.835786:ERROR:bus.cc(397)] Failed to connect to the bus: Failed to connect to socket /host/run/dbus/system_bus_socket: No such file or directory
[0404/112836.866694:ERROR:sandbox_linux.cc(377)] InitializeSandbox() called with multiple threads in process gpu-process.

The pdf generated is empty. The html format contains recent css features like flexbox and is not being convert via python packages like xhtml2pdf, pdfkit etc so I'm trying to use google chrome headless.