Update Dockerfile

Dockerfile

@@ -11,10 +11,7 @@ COPY . /app
 RUN pip install --no-cache-dir -r requirements.txt
 
 # Create a directory for NLTK data
-RUN mkdir -p /app/nltk_data
-
-# Set the NLTK_DATA environment variable
-ENV NLTK_DATA=/app/nltk_data
+RUN mkdir -p /nltk_data && chmod -R 755 /nltk_data
 
 # Download NLTK data
 RUN python -m nltk.downloader stopwords punkt