Added site-config for JUSUF

Added site-config for JUSUF. Using the same one as for JURECA-DC with adapted paths.

site-config/jusuf/compilers.yaml

+compilers:
+- compiler:
+    spec: gcc@11.3.0
+    paths:
+      cc: /p/software/jusuf/stages/2023/software/GCCcore/11.3.0/bin/gcc
+      cxx: /p/software/jusuf/stages/2023/software/GCCcore/11.3.0/bin/g++
+      f77: /p/software/jusuf/stages/2023/software/GCCcore/11.3.0/bin/gfortran
+      fc: /p/software/jusuf/stages/2023/software/GCCcore/11.3.0/bin/gfortran
+    flags: {}
+    operating_system: rocky8
+    target: x86_64
+    modules:
+      - StdEnv/2023
+    environment: {}
+    extra_rpaths: []
+- compiler:
+    spec: gcc@8.5.0
+    paths:
+      cc: /usr/bin/gcc
+      cxx: /usr/bin/g++
+      f77: null
+      fc: null
+    flags: {}
+    operating_system: rocky8
+    target: x86_64
+    modules: []
+    environment: {}
+    extra_rpaths: []