Permission Denied while building Django project with Docker

I'm trying to build a Django project with Docker, but I always get this error and I don't know how to handle it:

/usr/local/lib/python3.13/site-packages/django/coremanagement/commands
makemigrations.py:160: RuntimeWarning: Got an error checking a consistent 
migration history performed for database connection 'default': unable to open 
database file

There are more errors down the line, but all of them are about permission to create a db.sqlite3 database.

docker-compose.yml:

version: "3.9"

services:
  puppint:
    build: .
    container_name: puppint_app
    ports:
      - "8000:8000"
    volumes:
      - .:/app
      - ./static:/app/static
    env_file:
      - ./api.env
    working_dir: /app
    command: >
      sh -c "python puppint.py"

Dockerfile:

FROM python:3.13-slim AS builder

RUN mkdir /app

WORKDIR /app

ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

RUN pip install --upgrade pip

COPY requirements.txt /app/

RUN pip install --no-cache-dir -r requirements.txt

FROM python:3.13-slim

RUN useradd -m -r appuser && \
   mkdir /app && \
   chown -R appuser /app

COPY --from=builder /usr/local/lib/python3.13/site-packages/ /usr/local/lib/python3.13/site-packages/
COPY --from=builder /usr/local/bin/ /usr/local/bin/

WORKDIR /app

COPY --chown=appuser:appuser . .

ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

USER appuser

EXPOSE 8000

CMD ["python3 puppint.py"]

puppint.py is a script that starts making migrations. I've created it mainly for checking whether the user is a superuser or not. puppint.py:

import os
import subprocess
from time import sleep

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'puppint.settings')

import django
django.setup()
from django.contrib.auth.models import User

def run_command(command):
    try:
        subprocess.run(command, shell=True, check=True)
    except subprocess.CalledProcessError as e:
        print(f"Error when executing '{command}': {e}")

def check_superuser():
    if not User.objects.filter(is_superuser=True).exists():
        print("No superuser in database!\n")
        username = input("Enter username: ")
        email = input("Enter e-mail: ")
        password = input("Enter password: ")
        User.objects.create_superuser(username, email, password)

def main():

    print_banner()
    sleep(1)

    run_command("python manage.py makemigrations app")
    run_command("python manage.py migrate")
    run_command("python manage.py collectstatic --noinput")

    check_superuser()

    run_command("python manage.py runserver 0.0.0.0:8000")

if __name__ == "__main__":
    main()

Do you know how can I allow this permission for creating the database etc. when building the Django application? Thanks!

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