Update Dockerfile

Dockerfile

@@ -1,41 +1,48 @@
 # --- Stage 1: Build Stage ---
-# Use a full Python image to build our dependencies.
+# Use a specific Python version to ensure consistency.
 FROM python:3.11-slim as builder
 
-# Set the working directory.
-WORKDIR /app
+# Set the working directory
+WORKDIR /usr/src/app
 
-# Install poetry for dependency management.
-# Using poetry is a best practice for managing dependencies.
-RUN pip install poetry
+# Upgrade pip and install wheel to build dependencies efficiently
+RUN pip install --upgrade pip wheel
 
-# Copy only the files needed for dependency installation.
-# This leverages Docker's layer caching.
-COPY pyproject.toml poetry.lock ./
+# Copy only the requirements file to leverage Docker's layer caching.
+# This step will only be re-run if requirements.txt changes.
+COPY ./requirements.txt .
+
+# Build wheel files for all dependencies. This is faster and more reliable
+# for the final stage than a simple 'pip install'.
+RUN pip wheel --no-cache-dir --wheel-dir /usr/src/app/wheels -r requirements.txt
 
-# Install dependencies.
-# --no-root: Don't install the project itself, only the dependencies.
-# --no-dev: Exclude development dependencies.
-RUN poetry install --no-root --no-dev
 
 # --- Stage 2: Runtime Stage ---
-# Use a slim Python image for the final container.
+# Use the same slim Python base image for a smaller final image size.
 FROM python:3.11-slim
 
-# Set the working directory.
-WORKDIR /app
+# Set a non-root user for better security
+RUN addgroup --system app && adduser --system --group app
+
+# Set the working directory
+WORKDIR /home/app
+
+# Copy the pre-built wheel dependencies from the builder stage
+COPY --from=builder /usr/src/app/wheels /wheels
+COPY --from=builder /usr/src/app/requirements.txt .
 
-# Copy the installed dependencies from the builder stage.
-COPY --from=builder /app/.venv /.venv
+# Install the dependencies from local wheel files without needing to rebuild them.
+# --no-index and --find-links ensure pip only uses the local wheels.
+RUN pip install --no-cache /wheels/*
 
-# Set the PATH to include the virtual environment's bin directory.
-ENV PATH="/app/.venv/bin:$PATH"
+# Copy the application code into the container
+COPY --chown=app:app . .
 
-# Copy the application code.
-COPY . .
+# Switch to the non-root user
+USER app
 
-# Expose the port Gunicorn will run on.
+# Expose the port Gunicorn will listen on
 EXPOSE 8000
 
-# The command to run the application using Gunicorn.
+# The command to start the Gunicorn server
 CMD ["gunicorn", "-c", "gunicorn_config.py", "main:app"]