update action

.github/workflows/build_doc.yaml

@@ -1,13 +1,16 @@
 name: Build documentation
 
-env:
-  PR_NUMBER: ${{ github.event.number }}
 on:
   push:
     branches:
       - 'main'
   workflow_dispatch:
 
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
 
 jobs:
   build:
@@ -27,4 +30,3 @@ jobs:
       uses: JamesIves/github-pages-deploy-action@v4
       with:
         folder: docs_build
-        target-folder: latest