message: turn on mfem in gcc 11 docker
diff: @@ -17,7 +17,7 @@ RUN git clone --recursive --branch $branch --single-branch --depth 1 https://git
  # Build/install TPLs via spack and then remove the temporary build directory on success
  RUN cd axom_repo && python3 ./scripts/uberenv/uberenv.py --spack-config-dir=./scripts/spack/configs/docker/ubuntu20/ \
  --project-json=.uberenv_config.json \
  - --spec=%gcc@11.1.0 --prefix=/home/axom/axom_tpls -k \
  + --spec=%gcc@11.1.0+mfem --prefix=/home/axom/axom_tpls -k \
  && rm -rf /home/axom/axom_tpls/builds
  RUN mkdir -p /home/axom/export_hostconfig
  