Update Dockerfile

Dockerfile

@@ -55,7 +55,7 @@ ENV HOME=/home/user \
 #RUN chmod -R 755 $HOME/app
 # Copy the current directory contents into the container at $HOME/app setting the owner to the user
 #COPY --chown=user . $HOME/app
-RUN python3 -m pip install --upgrade pip
+RUN python -m pip install --upgrade pip
 # Install requirements.txt 
 RUN pip install --no-cache-dir --upgrade -r requirements.txt
 CMD ["python", "-m", "main"]