[CI] Cancel pending jobs for PRs on new commits (huggingface#324)

Cancel pending jobs for PRs on new commits

Author: anton-l

.github/workflows/pr_quality.yml

@@ -8,6 +8,10 @@ on:
     branches:
       - main
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   check_code_quality:
     runs-on: ubuntu-latest

.github/workflows/pr_tests.yml

@@ -5,6 +5,10 @@ on:
     branches:
       - main
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 env:
   HF_HOME: /mnt/cache
   OMP_NUM_THREADS: 8