Auto-cancel old builds when new commit pushed to branch (pythonGH-98009)

* Auto-cancel old builds when new commit pushed to branch

* Add a fallback

Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>

* Use the same group for all workflows.

Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
(cherry picked from commit 75751f4)

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

.github/workflows/build.yml

@@ -25,6 +25,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   check_source:
     name: 'Check for source changes'

.github/workflows/build_msi.yml

@@ -26,6 +26,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   build_win32:
     name: 'Windows (x86) Installer'

.github/workflows/doc.yml

@@ -28,6 +28,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   build_doc:
     name: 'Docs'

.github/workflows/verify-ensurepip-wheels.yml

@@ -16,6 +16,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   verify:
     runs-on: ubuntu-latest