Update Dockerfile

Dockerfile

@@ -14,12 +14,14 @@ RUN pip install --no-cache-dir -r requirements.txt
 COPY main.py .
 
 # Create the directory for uploads
+# This command runs as root, so it has permission
 RUN mkdir uploads
 
-# Create a non-root user and group for security
-RUN addgroup -S appgroup && adduser -S appuser -G appgroup
+# --- FIX: Use Debian-compatible commands to create a non-root user ---
+# Create a system group and user for security best practices
+RUN addgroup --system appgroup && adduser --system --ingroup appgroup --no-create-home appuser
 
-# Change the ownership of the app directory and its contents to the new user
+# Change the ownership of the app directory to the new user
 RUN chown -R appuser:appgroup /app
 
 # Switch to the non-root user