[workflows] add example-robot-data

Author: ManifoldFR

.github/workflows/gh-pages.yml

@@ -37,7 +37,7 @@ jobs:
           mamba install cmake make pkg-config doxygen graphviz
 
           # Main dependencies
-          mamba install eigen pinocchio fmt proxsuite-nlp
+          mamba install eigen pinocchio fmt proxsuite-nlp example-robot-data
 
       - name: Print environment
         shell: bash -l {0}