Cancel concurrent CI runs for same pr/commit (#4)

Signed-off-by: 1gtm <[email protected]>

Author: 1gtm

.github/workflows/ci.yml

@@ -9,7 +9,6 @@ on:
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
   cancel-in-progress: true
-
 jobs:
   build:
     name: Build