ensuring there is a yarn lock file

Author: danuw

.github/workflows/6-jekyll-gh-pages.yml

@@ -28,6 +28,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v3
+        working-directory: ./casdk-docs
         with:
           node-version: 18
           cache: yarn