infra: api docs build commit dir (#18147)

.github/workflows/api_doc_build.yml

@@ -26,6 +26,7 @@ jobs:
           mv langchain-google/libs/vertexai langchain/libs/partners/google-vertexai
 
       - name: Set Git config
+        working-directory: langchain
         run: |
           git config --local user.email "actions@github.com"
           git config --local user.name "Github Actions"
@@ -42,6 +43,7 @@ jobs:
           python-version: ${{ env.PYTHON_VERSION }}
           poetry-version: ${{ env.POETRY_VERSION }}
           cache-key: api-docs
+          working-directory: langchain
 
       - name: Install dependencies
         working-directory: langchain