Create app/Dockerfile

app/Dockerfile

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+# Use a smaller base image
+FROM python:3.9-alpine
+
+# Set work directory
+WORKDIR /usr/src/app
+
+# Set environment variables
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+
+# Install system dependencies
+RUN apk update && \
+    apk add --no-cache postgresql-dev gcc python3-dev musl-dev libjpeg zlib-dev
+
+# Install dependencies
+COPY ./requirements.txt .
+RUN pip install --upgrade pip && \
+    pip install --no-cache-dir -r requirements.txt
+
+# Remove the build dependencies to reduce image size
+RUN apk del gcc python3-dev musl-dev
+
+# Create a directory for static files
+RUN mkdir /usr/src/app/staticfiles