Merge branch 'bsc-config' into 'master'

add BSC's hsmcompute site-specific config

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!459

site-config/hsmcompute/compilers.yaml

+compilers:
+- compiler:
+    spec: gcc@10.1.0
+    paths:
+      cc: /apps/GCC/10.1.0/bin/gcc
+      cxx: /apps/GCC/10.1.0/bin/g++
+      f77: /apps/GCC/10.1.0/bin/gfortran
+      fc: /apps/GCC/10.1.0/bin/gfortran
+    flags: {}
+    operating_system: rhel8
+    target: ppc64le
+    modules: []
+    environment: {}
+    extra_rpaths: []

site-config/hsmcompute/packages.yaml

+packages:
+  cuda:
+    buildable: false
+    compiler: []
+    externals:
+    - modules:
+      - cuda/11.3
+      spec: cuda@11.3.58
+    providers: {}
+    target: []
+    variants: +allow-unsupported-compilers
+    version:
+    - 11.3.58
+  nccl:
+    buildable: false
+    externals:
+    - modules:
+      - nvhpc/21.5
+      spec: nccl@2.8.3 +cuda cuda_arch=72
+      prefix: /apps/NVHPC/2021.215/Linux_ppc64le/21.5/comm_libs/nccl
+    version:
+    - 2.13.4
+  cudnn:
+    buildable: false
+    externals:
+    - modules:
+      - cudnn/8.6.0
+      spec: cudnn@8.6.0
+      prefix: /apps/CUDNN/8.6.0
+    version:
+    - 8.6.0
+  python:
+    version: [3.8.11]
+  all:
+    target: [ppc64le]
+    compiler: [gcc@10.1.0]
+    providers:
+      blas: [essl, openblas, netlib-lapack]
+      lapack: [openblas, netlib-lapack]
+      scalapack: [netlib-scalapack]

site-config/hsmcompute/repos.yaml

+repos:
+- /apps/SPACK/0.19.2/spack-ebrains-releases/ebrains-23-06-stable-hsmcompute

site-config/hsmcompute/spack.yaml

+spack:
+  specs:
+    - apbs ^openblas
+    - harfbuzz@4.2.1