Update Dockerfile

Dockerfile

@@ -7,7 +7,7 @@ COPY ./requirements.txt /code/requirements.txt
 RUN apt-cache search mesa
 RUN apt-get update && apt-get install -y libgl1-mesa-glx libosmesa6
 RUN apt-get install -y python3-opengl
-
+RUN apt-get update -y && apt-get upgrade -y && apt-get install -y python3-pip python-is-python3 && rm -rf /var/lib/apt/lists/* 
 # Run the command inside your image filesystem
 RUN pip install --upgrade pip && \
     pip install gym && \