Add concurrency

Author: blakedrumm

.github/workflows/push-changes-to-blakedrumm-fileshare.yml

@@ -12,6 +12,10 @@ on:
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
+  
+concurrency: 
+  group: ${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs: