Update Dockerfile

Dockerfile

@@ -1,13 +1,17 @@
 # --- Stage 1: Build Dependencies ---
 FROM python:3.9-slim as builder
 
+# Set environment variables to prevent writing .pyc files and for unbuffered output
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+
 # Set working directory
 WORKDIR /app
 
-# Install uvloop first as it's a build dependency for some packages
-RUN pip install --no-cache-dir uvloop
+# Install uvloop and gunicorn first as they are core dependencies
+RUN pip install --no-cache-dir uvloop gunicorn
 
-# Copy requirements and install them
+# Copy requirements and install the rest of the packages
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
@@ -18,16 +22,24 @@ FROM python:3.9-slim
 # Set the working directory
 WORKDIR /app
 
+# Set same environment variables for consistency
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+
 # Create a non-root user and group for security
-RUN addgroup --system app && adduser --system --group app
+# This is a more robust way to create a user with a home directory
+RUN addgroup --system app && adduser --system --ingroup app --shell /bin/sh --home /app app
 
-# Copy installed packages from the builder stage
+# Copy installed packages AND binaries from the builder stage
+# This is the CRUCIAL FIX: copying /usr/local/bin where gunicorn lives
 COPY --from=builder /usr/local/lib/python3.9/site-packages /usr/local/lib/python3.9/site-packages
+COPY --from=builder /usr/local/bin /usr/local/bin
 
 # Copy the application code
 COPY . .
 
 # Change ownership of the app directory to the non-root user
+# This ensures the user can read the files
 RUN chown -R app:app /app
 
 # Switch to the non-root user
@@ -37,4 +49,5 @@ USER app
 EXPOSE 8000
 
 # Run the application using Gunicorn
+# The command is now guaranteed to be in the PATH
 CMD ["gunicorn", "-c", "gunicorn_conf.py", "main:app"]