Update Dockerfile

Dockerfile

@@ -14,11 +14,14 @@ USER user
 # Create the app directory
 WORKDIR $HOME/app
 
-# Copy the current directory contents into the container at $HOME/app and set the owner to the user
-COPY --chown=user . $HOME/app
+# Copy the requirements.txt file first to leverage Docker cache
+COPY --chown=user requirements.txt $HOME/app/
 
 # Install requirements.txt
 RUN pip install --no-cache-dir --upgrade -r requirements.txt
 
+# Copy the rest of the application code
+COPY --chown=user . $HOME/app
+
 # Start the FastAPI app on port 7860, the default port expected by Spaces
 CMD ["python", "run.py", "--voicevox_dir", "../linux-cpu", "--host", "0.0.0.0", "--port", "7860"]