Update Dockerfile

Dockerfile

@@ -7,10 +7,12 @@ WORKDIR /app
 COPY . .
 
 # Install Python dependencies listed in requirements
-RUN pip install --no-cache-dir --upgrade -r requirements.txt
+RUN pip install --no-cache-dir --upgrade pip \
+    && pip install --no-cache-dir gunicorn \
+    && pip install --no-cache-dir -r requirements.txt
 
 #Define the command to run the Flask application on port 7860 and make it accessible externally
 # - '-w 4' : Uses 4 worker processes to handle requests.
 # - '-b 0.0.0.0:7860': Binds the Flask app to the specified host and port.
 # - 'app:sales_prediction_api': Specifies the entry point of the Flask app.
-CMD ["gunicorn", "w", "4", "-b", "0.0.0.0:7860" "app:sales_prediction_api"]
+CMD ["gunicorn", "-w", "4", "-b", "0.0.0.0:7860" "app:sales_prediction_api"]