Add building subject-viewers to the deploy_storybook.yml (#6489)

Co-authored-by: Delilah C. <[email protected]>

.github/workflows/deploy_storybook.yml

@@ -20,6 +20,7 @@ jobs:
 
       - run: yarn install --production=false --frozen-lockfile
       - run: yarn workspace @zooniverse/react-components build:es6
+      - run: yarn workspace @zooniverse/subject-viewers build:es6
       - name: Deploy to GH Pages
         run: yarn deploy-storybook -- --ci
         env: