fix ci documentation

.github/workflows/documentation.yml

@@ -13,17 +13,18 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
+      - uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+          ruby-version: 2.7
       - name: Install dependencies
         run: |
           pip install sphinx sphinx-book-theme
       - name: Sphinx build
         run: |
           cd docs/
           make html
-      - uses: ruby/setup-ruby@v1
-        with:
-          bundler-cache: true
-          ruby-version: 2.7
+          cd ..
       - name: Yard Doc build
         run: |
           bundle exec yard