Use netlib blas on Rehat clone runners (#4431)

Author: garth-wells

.github/workflows/ci-spack.yml

@@ -77,7 +77,6 @@ jobs:
           spack -e py add python py-nanobind py-numpy py-mpi4py py-petsc4py py-slepc4py \
             py-scikit-build-core@1+pyproject py-setuptools py-cffi
           spack -e py add py-pip cmake catch2 py-pytest py-pytest-xdist ninja
-          spack -e py add openblas
           spack -e py add py-gmsh ^gmsh~fltk~med~mmg+external ^opencascade~draw py-pyvista ^mesa~llvm \
             py-networkx py-matplotlib py-pyamg py-numba  ^llvm~clang~lldb~lld~offload~libomptarget~polly targets=x86 \
             py-scipy

.github/workflows/spack-config/gh-actions-rh.yml

@@ -13,6 +13,13 @@ spack:
     all:
       require:
       - target=x86_64_v3
+    # OpenBLAS segfaults on AMD EPYC runners; see PR #4414.
+    blas:
+      require:
+      - netlib-lapack
+    lapack:
+      require:
+      - netlib-lapack
 
   mirrors:
     local-buildcache: