anchor.diff:  #-----------------------------------------------------------------------------#
   # Copy and build MOOSE framework and tests
   #-----------------------------------------------------------------------------#
  -COPY . ${MOOSE_DIR}
  +RUN chown -R dev:dev /opt /home/dev
  +
  +USER dev
  +COPY --chown=dev:dev . ${MOOSE_DIR}
   RUN cd test ; make -j ${MOOSE_JOBS}
  +USER root
   
   #-----------------------------------------------------------------------------#
   # Add needed env vars to /etc/environment
  
positive.code: ARG LIBMESH_REV
  ENV LIBMESH_DIR=/usr/local \
  libmesh_CPPFLAGS="-D LIBMESH_HAVE_XDR"
  COPY scripts/update_and_rebuild_libmesh.sh ${MOOSE_DIR}/scripts/update_and_rebuild_libmesh.sh
  RUN git clone https://github.com/libMesh/libmesh.git ; \
  cd libmesh ; \
  git checkout ${LIBMESH_REV} ; \
  
negative.code: WORKDIR /opt
  
  ARG MOOSE_JOBS=1
  
  #-----------------------------------------------------------------------------#
  # Add user dev
  #-----------------------------------------------------------------------------#
  RUN useradd dev ; \
  mkdir -p /home/dev/.ssh ; \
  chmod 700 /home/dev/.ssh ; \
  chown -R dev:dev /home/dev
  
  #-----------------------------------------------------------------------------#
  # Install managed packages and clear cache
  