new: disable windows and macos tests on gpu and its child branches

.github/workflows/python-tests.yml

@@ -2,7 +2,7 @@ name: Tests
 
 on:
   push:
-    branches: [ master, main ]
+    branches: [ main ]
   schedule:
     - cron: 0 0 * * *
   pull_request:
@@ -21,10 +21,20 @@ jobs:
           - '3.10.x'
           - '3.11.x'
           - '3.12.x'
-        os:
-          - ubuntu-latest
-          - macos-latest
-          - windows-latest
+        os: [ ubuntu-latest ]
+        include:
+          - os: macos-latest
+            python-version: [ '3.8.x', '3.9.x', '3.10.x', '3.11.x', '3.12.x' ]
+            if: >-
+              ${{ !contains(github.ref, 'refs/heads/gpu') &&
+                  github.event_name != 'pull_request' ||
+                  github.event.pull_request.base.ref != 'gpu' }}
+          - os: windows-latest
+            python-version: [ '3.8.x', '3.9.x', '3.10.x', '3.11.x', '3.12.x' ]
+            if: >-
+              ${{ !contains(github.ref, 'refs/heads/gpu') &&
+                  github.event_name != 'pull_request' ||
+                  github.event.pull_request.base.ref != 'gpu' }}
 
     runs-on: ${{ matrix.os }}