Update build.yml

Author: torresc24

.github/workflows/build.yml

@@ -19,4 +19,6 @@ jobs:
       - name: Set up Node ${{ matrix.nodeversion }}
         uses: actions/setup-node@v2
         with:
-          node-version: ${{ matrix.node-version }}
+          node-version: ${{ matrix.node-version }}
+      - name: Before deploy
+        run: npm run docs