TMP: Tweak cancellation of workflows

Author: zanieb

.github/workflows/apple.yml

@@ -2,12 +2,12 @@ name: MacOS Python build
 
 on:
   push:
+    branches: [main]
   pull_request:
-  schedule:
-    - cron: "13 11 * * *"
+  workflow_dispatch:
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
+  group: ${{ github.workflow }}-${{ github.ref_name }}-${{ github.event.pull_request.number || github.sha }}
   cancel-in-progress: true
 
 jobs:

.github/workflows/linux.yml

@@ -2,12 +2,12 @@ name: Linux Python build
 
 on:
   push:
+    branches: [main]
   pull_request:
-  schedule:
-    - cron: "13 11 * * *"
+  workflow_dispatch:
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
+  group: ${{ github.workflow }}-${{ github.ref_name }}-${{ github.event.pull_request.number || github.sha }}
   cancel-in-progress: true
 
 jobs:

.github/workflows/windows.yml

@@ -2,12 +2,12 @@ name: Windows Python build
 
 on:
   push:
+    branches: [main]
   pull_request:
-  schedule:
-    - cron: "13 11 * * *"
+  workflow_dispatch:
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
+  group: ${{ github.workflow }}-${{ github.ref_name }}-${{ github.event.pull_request.number || github.sha }}
   cancel-in-progress: true
 
 jobs: