[CI] Only update on push to docs

.gitea/workflows/build-docs.yml

@@ -1,9 +1,8 @@
 name: Build docs
 on:
-  push
-  # push:
-  #   paths:
-  #     - 'docs/**'
+  push:
+    paths:
+      - 'docs/**'
 jobs:
   build_docs:
     runs_on: ubuntu-latest