fix image arch

.drone.yml

@@ -20,8 +20,8 @@ steps:
     path: /drone/src/docs
   commands:
   - pip install -U -r ./requirements.txt
-  - mkdocs build
-  
+  - cd doc && mkdocs build
+
   # image: squidfunk/mkdocs-material:7.1.9
   # volumes:
   # - name: site