Add concurrency control to lint workflow

Author: alexaka1

.github/workflows/lint.yml

@@ -9,6 +9,9 @@ env:
   CI: 'true'
   DO_NOT_TRACK: '1'
   NEXT_TELEMETRY_DISABLED: '1'
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
 
 jobs:
   lint: