[CI] Fail if any notebook fails

Part of OpenAssetIO/OpenAssetIO#1302.

The CI job that checks if notebooks can be executed was expected to fail
until upstream OpenAssetIO changes were available, however the job
succeeded. Upon checking the logs we can see the failure of the new
notebook, but the job finished without error. It seems that `find -exec`
doesn't error.

Signed-off-by: David Feltell <[email protected]>

Author: feltech

.github/workflows/examples.yml

@@ -34,9 +34,11 @@ jobs:
         # Execute all the notebooks apart from the Hybrid Plugin System,
         # which requires a build of SimpleCppManager
         run: >
-          find examples -maxdepth 1 -name "*.ipynb"
-          ! -name "hybrid_plugin_system.ipynb"
-          -exec jupyter nbconvert --to html --execute {} \;
+          for notebook in examples/*.ipynb; do
+              [[ "$notebook" == *"hybrid_plugin_system.ipynb" ]] && continue
+              echo "Executing $notebook..."
+              jupyter nbconvert --to html --execute "$notebook"
+          done
 
   test-cpp-notebooks:
     # A special job just for the Hybrid Plugin System because it needs a