Auto-cancel old GitHub Actions workflows. (#356)

Signed-off-by: Ryan Northey <ryan@synca.io>

Author: phlax

.github/workflows/format.yml

@@ -31,6 +31,11 @@ on:
   schedule:
     - cron: '0 0 * * *'
 
+concurrency:
+
+  group: ${{ github.head_ref || github.run_id }}-${{ github.workflow }}
+  cancel-in-progress: true
+
 jobs:
 
   addlicense:

.github/workflows/test.yml

@@ -31,6 +31,11 @@ on:
   schedule:
     - cron: '0 0 * * *'
 
+concurrency:
+
+  group: ${{ github.head_ref || github.run_id }}-${{ github.workflow }}
+  cancel-in-progress: true
+
 jobs:
 
   test_data: