Refactor Dockerfile to set working directory and improve user permissions

Dockerfile

@@ -15,18 +15,19 @@ FROM python:${PYTHON_VERSION}-slim as base
 # the application crashes without emitting any logs due to buffering.
 ENV PYTHONUNBUFFERED=1
 
+WORKDIR /app
+
 RUN useradd -m -s /bin/bash appuser && \
     # Give necessary permissions
     chown -R appuser:appuser /app
-
-USER appuser
-
-ENV HOME=/home/appuser \
+    
+    USER appuser
+    
+    ENV HOME=/home/appuser \
     PATH=/home/appuser/.local/bin:$PATH
 
 ENV TRANSFORMERS_CACHE=$HOME/app/.cache/huggingface/hub
 
-WORKDIR $HOME/app
 
 COPY --chown=appuser ./requirements.txt requirements.txt
 RUN mkdir -p /app/.cache \