CI: Use concurrency groups to reduce CI load

Author: effigies

.github/workflows/contrib.yml

@@ -18,6 +18,10 @@ defaults:
   run:
     shell: bash
 
+concurrency:
+  group: contrib-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   stable:
     # Check each OS, all supported Python, minimum versions and latest releases

.github/workflows/package.yml

@@ -16,6 +16,10 @@ defaults:
   run:
     shell: bash
 
+concurrency:
+  group: package-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   package:
     # Build packages and upload

.github/workflows/tests.yml

@@ -23,6 +23,10 @@ defaults:
   run:
     shell: bash
 
+concurrency:
+  group: tests-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   stable:
     # Check each OS, all supported Python, minimum versions and latest releases

.github/workflows/tutorials.yml

@@ -5,6 +5,10 @@ on:
     branches:
       - 'rel/*'
 
+concurrency:
+  group: tutorials-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   tutorial:
     runs-on: ubuntu-latest