Add gurobi 11

Maybe to merge before the externals which would install only gurobi 11, I suppose

ci/setup_spack.sh

@@ -58,10 +58,6 @@ cp ${STACK_CONFIG_PATH}/spack.yaml ${SPACK_SYSTEM_CONFIG_PATH}
 
 replace_placholders ${SPACK_SYSTEM_CONFIG_PATH}/spack.yaml
 
-cp -r "${STACK_CONFIG_PATH}/templates" ${SPACK_SYSTEM_CONFIG_PATH}
-
-
-
 for file in mirrors packages concretizer config definitions modules
 do
   for suffix in ${!file_mapping[@]}
@@ -78,12 +74,22 @@ do
   done
 done
 
-
-cat <<EOF > ${SPACK_SYSTEM_CONFIG_PATH}/config_stack.yaml
-config:
+echo "config:" > ${SPACK_SYSTEM_CONFIG_PATH}/config_stack.yaml
+if [ -d cp -r "${STACK_CONFIG_PATH}/templates" ${SPACK_SYSTEM_CONFIG_PATH} ]
+then
+   cp -r "${STACK_CONFIG_PATH}/templates" ${SPACK_SYSTEM_CONFIG_PATH}
+   cat <<EOF >> ${SPACK_SYSTEM_CONFIG_PATH}/config_stack.yaml
   template_dirs:
     - ${SPACK_SYSTEM_CONFIG_PATH}/templates
 EOF
+fi
+
+if [ -d "${STACK_CONFIG_PATH}/licenses" ]
+then
+  cp -r "${STACK_CONFIG_PATH}/licenses" ${SPACK_SYSTEM_CONFIG_PATH}
+  echo "  license_dir: ${SPACK_SYSTEM_CONFIG_PATH}/licenses" >> ${SPACK_SYSTEM_CONFIG_PATH}/config_stack.yaml
+fi
+
 
 cat <<EOF > ${SPACK_SYSTEM_CONFIG_PATH}/modules_stack.yaml
 modules: