Update Dockerfile to combine pip setup with package installation for optimized layering and efficiency.

Dockerfile

@@ -13,13 +13,11 @@ RUN useradd -m -u 1000 appuser
 
 WORKDIR /app
 
-COPY requirements.txt .
+COPY . .
 
-RUN pip install --no-cache-dir --upgrade pip && \
+RUN pip install --no-cache-dir --upgrade pip setuptools wheel && \
     pip install --no-cache-dir -r requirements.txt
 
-COPY . .
-
 USER appuser
 
 EXPOSE ${PORT}