[Python] Django application deployement with Docker

I am trying to deploy my django app with docker. But when it come to excute my script to be sure that the databse (postgres) is ready, I allways get this error : chmod: /app/scripts/wait-for-it.sh: Permission denied and then the container stop running.

This is my dockerfile :

# Stage 1: Base build stage
FROM python:3.13-slim AS builder

# Create the app directory
RUN mkdir /api

# Set the working directory
WORKDIR /api

# Set environment variables to optimize Python
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

RUN apt-get update && apt-get install -y --no-install-recommends \
build-essential \
libpcre3-dev \
libssl-dev \
python3-dev \
libpango1.0-dev \
libcairo2-dev \
libpq-dev \
bash \
fontconfig \
fonts-dejavu-core \
fonts-droid-fallback \
fonts-freefont-ttf \
fonts-liberation \
&& rm -rf /var/lib/apt/lists/*


# Install dependencies first for caching benefit
RUN pip install --upgrade pip
RUN mkdir /requirements
COPY ./requirements/. ./requirements/.

RUN set -e; \
pip3 install --upgrade pip && \
pip3 install uwsgi && \
pip3 install --default-timeout=100 --no-cache-dir -r ./requirements/stage.txt

# Stage 2: Production stage
FROM python:3.13-slim

RUN useradd -m -r -g www-data app_user && \
mkdir /api && \
chown -R app_user /api

# Copy the Python dependencies from the builder stage
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/

# Set the working directory
WORKDIR /api

# Copy application code
COPY --chown=app_user:app_user . .
RUN chown -R app_user:www-data /api

# Set environment variables to optimize Python
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

RUN chown app_user:www-data ./config/uwsgi && \
mkdir -p /run/uwsgi && \
chown app_user:www-data /run/uwsgi

# Switch to non-root user
USER app_user

# Expose the application port
EXPOSE 8000

# Make entry file executable
RUN chmod +x /api/config/scripts/wait-for-it.sh

# Verify if postgress ready !
CMD ["/api/config/scripts/wait-for-it.sh"]


This is my api service in my yml file :

services:
api:
image: "${MY_API_IMAGE_FROM_ENV}"
restart: always
command: >
sh -c "/api/config/scripts/wait-for-it.sh db:5432
&& python /api/project/manage.py makemigrations
&& python /api/project/manage.py migrate
&& uwsgi --ini /api/config/uwsgi/uwsgi.stage.ini"
volumes:
- .:/api
- uwsgi_socket:/run/uwsgi
- /var/log/project:/api/logs
environment:
- DJANGO_SETTINGS_MODULE=project.settings.stage
- POSTGRES_USER=${BACKEND_USER_DB}
- POSTGRES_PASSWORD=${BACKEND_PASSWORD_DB}
- POSTGRES_DB=${BACKEND_DB_NAME}
- POSTGRES_PORT= ${BACKEND_PORT_DB}
env_file:
- .env
depends_on:
- db
networks:
- app_network
container_name: api


I thought the problem come from the user priveleges so I try to create a user and give it the permissions to execute the script. But till getting this error in the app container.

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