Add netcdf build dependency

Author: weiji14

.github/workflows/ci_tests.yaml

@@ -123,7 +123,7 @@ jobs:
       # Install build dependencies from conda-forge
       - name: Install build dependencies
         shell: bash -l {0}
-        run: conda install cmake
+        run: conda install cmake netcdf
 
       # Install GMT master branch
       - name: Install GMT from master