fix: build in ci

Author: agoose77

.github/workflows/deploy.yml

@@ -39,6 +39,10 @@ jobs:
           python-version: '3.12' 
       - name: Install MyST Markdown
         run: npm install -g mystmd
+      - name: Build plugin
+        run: |
+          npm install
+          npm run build
       - name: Build HTML Assets
         run: myst build --html
       - name: Upload artifact