ci: add concurrency group to deploy workflow

Author: NGPixel

.github/workflows/build.yml

@@ -47,6 +47,10 @@ on:
         required: true
         type: boolean
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   # -----------------------------------------------------------------
   # PREPARE