anchor.diff:  ENV PETSC_ARCH=$PETSC_ARCH
   
   
  -FROM nvidia/cuda:11.6.0-runtime-ubuntu20.04 AS release-base-gpu
  +FROM nvidia/cuda:${CUDA_VERSION}-runtime-ubuntu${UBUNTU_VERSION} AS release-base-gpu
   
   ONBUILD RUN apt-get update && \
       \
  
positive.code: ARG PLATFORM=cpu
  ARG PETSC_VERSION=3.17.3
  ARG SLEPC_VERSION=3.17.1
  
  
  FROM python:3.9-bullseye AS base-cpu
  
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 && \
  