Issue in Starting Django project with Docker

[Prabakaran141]

Hello Python Geeks,

Looking for geeks' insight for django-docker related issues. I'm not able to run the command "docker-compose run --rm app sh -c "django-admin startproject app ."

Error:
Traceback (most recent call last):
  File "/py/bin/django-admin", line 8, in <module>
    sys.exit(execute_from_command_line())
  File "/py/lib/python3.9/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "/py/lib/python3.9/site-packages/django/core/management/__init__.py", line 413, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/py/lib/python3.9/site-packages/django/core/management/base.py", line 354, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/py/lib/python3.9/site-packages/django/core/management/base.py", line 398, in execute
    output = self.handle(*args, **options)
  File "/py/lib/python3.9/site-packages/django/core/management/commands/startproject.py", line 21, in handle
    super().handle('project', project_name, target, **options)
  File "/py/lib/python3.9/site-packages/django/core/management/templates.py", line 160, in handle
    with open(new_path, 'w', encoding='utf-8') as new_file:
PermissionError: [Errno 13] Permission denied: '/app/manage.py'

Adding docker related content

FROM python:3.9-alpine3.13
LABEL maintainer="prabakaran141"

ENV PYTHONUNBUFFERED 1

COPY ./requirements.txt /tmp/requirements.txt
COPY ./requirements.dev.txt /tmp/requirements.dev.txt
COPY ./app /app
WORKDIR /app
EXPOSE 8000

ARG DEV=false
RUN python -m venv /py && \
/py/bin/pip install --upgrade pip && \
/py/bin/pip install -r /tmp/requirements.txt && \
if [ $DEV = "true" ]; \
then /py/bin/pip install -r /tmp/requirements.dev.txt ; \
fi && \
rm -rf /tmp && \
adduser \
--disabled-password \
--no-create-home \
django-user

ENV PATH="/py/bin:$PATH"

USER django-user

I have followed some links in stackoverflow, which didn't work.
https://stackoverflow.com/questions/7353...-manage-py,
https://stackoverflow.com/questions/5572...rying-to-c

Will be waiting for your valuable inputs.