Error out if emscripten tests fail

Author: mcbarton

.github/workflows/emscripten.yml

@@ -550,6 +550,7 @@ jobs:
       if: ${{ runner.os != 'windows' }}
       shell: bash -l {0}
       run: |
+        set -e
         ./emsdk/emsdk activate ${{matrix.emsdk_ver}}
         source ./emsdk/emsdk_env.sh
         micromamba create -f environment-wasm.yml --platform=emscripten-wasm32