Downgrades libnetcdf for e3sm

.github/workflows/testing.yml

@@ -174,6 +174,14 @@ jobs:
 
           conda activate base
 
+          # container libnetcdf is 4.9.2 as cesm requires esmf >8.6.1
+          # e3sm scorpio incompatible with 4.9.2, downgrade to 4.9.1
+          # only reference found about scorpio incompatibility with 4.9.2 (https://github.com/E3SM-Project/scorpio/issues/554#issuecomment-1877361470)
+          # TODO open scorpio issue, possible solutions; 1. support two conda environments in container 2. maybe move from conda to spack? build all libraries in image
+          if [[ "${CIME_MODEL}" == "e3sm" ]]; then
+            mamba install -y 'libnetcdf=4.9.1'
+          fi
+
           pytest -vvv --cov=CIME --machine docker --no-fortran-run --no-teardown CIME/tests/test_sys*
       - uses: mxschmitt/action-tmate@v3
         if: ${{ !always() }}