Adding environment variable to fix MPI issue in LMU cluster. Need to find a more general solution.

templates/run_icon.sh

@@ -17,5 +17,9 @@ source ${SPACK_ENV}
 # Load icon module
 spack load icon-nwp@%ICON_VERSION%
 
+# FIXME: What is the best way of adding extra required parameters in a flexible manner?
+export OMPI_MCA_btl_tcp_if_include='10.0.0.0/8'
+
+
 # Run icon
 srun icon
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