Cancel previous GH commit jobs (#1690)

.github/workflows/photon-code-docs.yml

@@ -10,16 +10,16 @@ on:
     branches: [ main ]
   merge_group:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
 # Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
 permissions:
   contents: read
   pages: write
   id-token: write
 
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
 jobs:
   build-client:
     name: "PhotonClient Build"