concurrency cancel workflows

Author: olgavrou

.github/workflows/black_checker.yml

@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   black-check:
     container:

.github/workflows/unit_tests.yml

@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build: