Update conf.py

Author: mcbarton

docs/source/conf.py

@@ -15,6 +15,7 @@
                           export MAMBA_ROOT_PREFIX="/home/docs/.local/share/mamba";\
                           __mamba_setup="$("$MAMBA_EXE" shell hook --shell bash --root-prefix "$MAMBA_ROOT_PREFIX" 2> /dev/null)";\
                           alias micromamba="$MAMBA_EXE";\
+                          eval "$(micromamba shell hook --shell bash)";\
                           micromamba create -f environment-wasm-build.yml -y;\
                           micromamba activate xeus-cpp-wasm-build;\
                           micromamba create -f environment-wasm-host.yml --platform=emscripten-wasm32;\