Update Dockerfile

Dockerfile

@@ -7,7 +7,13 @@ RUN apt-get update && apt-get install -y \
     build-essential
 
 WORKDIR /app
-COPY . .
+
+# Upgrade pip first
+RUN pip install --no-cache-dir --upgrade pip
+
+COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
+COPY . .
+
 CMD ["python3", "app.py"]