Update build.yml

Author: raar1

.github/workflows/build.yml

@@ -22,6 +22,10 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install wheel
+        conda install -c conda-forge jupyterlab
+        conda install -c conda-forge nodejs=12
+        conda install -c conda-forge typescript
+        conda install ruamel.yaml
         python -m pip install -r requirements.txt
     - name: Build the extension
       run: |