anchor.diff:  ARG PLATFORM=cpu
   ARG PETSC_VERSION=3.17.3
   ARG SLEPC_VERSION=3.17.1
  +ARG CUDA_VERSION=11.6.2
  +ARG UBUNTU_VERSION=20.04
   
   
   FROM python:3.9-bullseye AS base-cpu
  
positive.code: ENV PETSC_ARCH=$PETSC_ARCH
  
  
  FROM nvidia/cuda:11.6.0-runtime-ubuntu20.04 AS release-base-gpu
  
  ONBUILD RUN apt-get update && \
      \
  
negative.code: ENV PETSC_CONFIG_FLAGS="$PETSC_CONFIG_FLAGS --download-scalapack=1 --with-mumps=1"
  
  
  FROM nvidia/cuda:${CUDA_VERSION}-devel-ubuntu${UBUNTU_VERSION} AS base-gpu
  
  # install dependencies
  ONBUILD RUN apt-get update && \
  