update Dockerfile

Dockerfile

@@ -1,10 +1,9 @@
 FROM python:3.9
 
-WORKDIR /code
+RUN apt-get update && apt-get upgrade -y && apt-get install -y libgl1-mesa-dev
 
+WORKDIR /code
 COPY ./requirements.txt /code/requirements.txt
-
-RUN apt-get update && apt-get upgrade -y && apt-get install -y libgl1-mesa-dev
 RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
 
 # Set up a new user named "user" with user ID 1000