Enter documentation repository before running yarn build

.github/workflows/github_pages_deploy.yml

@@ -21,10 +21,11 @@ jobs:
             cache: yarn
             cache-dependency-path: documentation/yarn.lock
         - name: Install dependencies
-          working-directory: documentation
           run: yarn install --frozen-lockfile --non-interactive
         - name: Build
-          run: yarn build
+          run: |
+            cd documentation
+            yarn build
         # 👆 Build steps
         - name: Setup Pages
           uses: actions/configure-pages@v3