Run baf w/ a single thread

Author: nmnobre

.github/workflows/extraction_test.yml

@@ -162,7 +162,7 @@ jobs:
         export FAB_WORKSPACE=$PWD/fab_workspace
         # Run the Fab build script
         ${LFRIC_CORE}/build.sh ./fab_gungho_model_extract.py   \
-          --profile ${COMPILER_PROFILE} --nproc 4 -fc $LDMPI -ld $LDMPI  -cc $CC
+          --profile ${COMPILER_PROFILE} --nproc 1 -fc $LDMPI -ld $LDMPI  -cc $CC
 
         # Run gungho (which will create the NetCDF kernel data files)
         # -----------------------------------------------------------