Cancel previous robot workflows on new push

Author: martinpaljak

.github/workflows/robot.yml

@@ -10,6 +10,10 @@ on:
       - fork
       - next
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     runs-on: ubuntu-24.04