Update stride-docs-staging-azure.yml - Adding branch reference

.github/workflows/stride-docs-staging-azure.yml

@@ -63,6 +63,7 @@ jobs:
         token: ${{ secrets.GITHUB_TOKEN }}
         path: stride
         lfs: true
+        ref: master
 
     - name: Install DocFX
       # This installs the latest version of DocFX and may introduce breaking changes
@@ -111,4 +112,4 @@ jobs:
         app-name: 'stride-doc'
         slot-name: 'staging'
         publish-profile: ${{ secrets.AZUREAPPSERVICE_PUBLISHPROFILE_32FCD402B970463A9143B24C9B225749 }}
-        package: ./${{ env.DOCS_PATH }}/_site
+        package: ./${{ env.DOCS_PATH }}/_site