build optimization with upgrading python image and better dockerfile layering

Dockerfile.prod

@@ -1,61 +1,51 @@
-# pull official base image
-FROM python:3.10-alpine
-
-# set work directory
+# =======================================================
+# Optimized Production Dockerfile for Django Backend
+# Using Debian-slim for instant pre-compiled binary wheels
+# (scikit-image, numpy, scipy install in seconds vs 10m on Alpine)
+# =======================================================
+FROM python:3.10-slim
+
+# Set work directory
 WORKDIR /usr/src/app
 
-# set environment variables
-ENV PYTHONDONTWRITEBYTECODE 1
-ENV PYTHONUNBUFFERED 1
-
-# install psycopg2 dependencies and ffmpeg
-RUN apk update && apk add --no-cache \
-    git \
-    wget \
-    unzip \
-    curl \
-    postgresql-dev \
+# Set environment variables
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1 \
+    CHROME_BIN=/usr/bin/chromium \
+    CHROME_DRIVER=/usr/bin/chromedriver \
+    DISPLAY=:99
+
+# 1. System Dependencies (Cached permanently unless system packages change)
+RUN apt-get update && apt-get install -y --no-install-recommends \
     gcc \
     g++ \
-    python3-dev \
-    musl-dev \
-    jpeg-dev \
-    zlib-dev \
-    freetype-dev \
-    gnupg \
-    chromium \
-    chromium-chromedriver \
-    harfbuzz \
-    nss \
-    freetype \
-    ttf-freefont \
-    mesa-gl \
-    alsa-lib \
+    curl \
+    git \
+    libpq-dev \
+    libjpeg62-turbo-dev \
+    zlib1g-dev \
+    libfreetype6-dev \
+    gettext \
     ffmpeg \
-    gettext
-
-
-# Set environment variables for Chrome
-ENV CHROME_BIN=/usr/bin/chromium-browser
-ENV CHROME_DRIVER=/usr/bin/chromedriver
-
-# install dependencies
-RUN pip install --upgrade pip
-#RUN python -m pip install Pillow
+    chromium \
+    chromium-driver \
+    && rm -rf /var/lib/apt/lists/*
 
+# 2. Python Dependencies (Cached unless requirements.txt changes)
 COPY ./requirements.txt .
+RUN pip install --upgrade pip && \
+    pip install -r requirements.txt
 
-RUN --mount=type=cache,target=/root/.cache  pip install -r requirements.txt
-
-# copy entrypoint.sh
-COPY .env.prod .env
+# 3. Entrypoint script (Cached)
 COPY ./entrypoint.sh .
-RUN sed -i 's/\r$//g' /usr/src/app/entrypoint.sh
-RUN chmod +x /usr/src/app/entrypoint.sh
+RUN sed -i 's/\r$//g' /usr/src/app/entrypoint.sh && \
+    chmod +x /usr/src/app/entrypoint.sh
 
-# copy project
+# 4. Application Source Code (Changes frequently on git push)
 COPY . .
-# Set display port to avoid crash
-ENV DISPLAY=:99
-# run entrypoint.sh
+
+# Run entrypoint
 ENTRYPOINT ["/usr/src/app/entrypoint.sh"]
+