Update Dockerfile

Dockerfile

@@ -7,9 +7,11 @@ FROM python:3.9-slim
 # 2. Set the working directory inside the container.
 WORKDIR /code
 
-# 3. Set the HF_HOME environment variable to a writable directory.
+# 3. Set environment variables.
 # This prevents the /.cache permission error.
 ENV HF_HOME="/tmp/.cache/huggingface"
+# This explicitly tells Flask which file contains the application.
+ENV FLASK_APP=app.py
 
 # 4. Copy the requirements file into the working directory.
 COPY ./requirements.txt /code/requirements.txt
@@ -23,7 +25,5 @@ COPY ./ /code/
 # 7. Expose the port that the application will run on.
 EXPOSE 7860
 
-# 8. Define the command to run the application using Gunicorn (production standard).
-# This is more robust than `flask run` and explicitly points to the 'app' object
-# within the 'app.py' module, which should solve the route discovery issue.
-CMD ["gunicorn", "--bind", "0.0.0.0:7860", "app:app"]
+# 8. Define the command to run the application using Flask's built-in server.
+CMD ["flask", "run", "--host=0.0.0.0", "--port=7860"]