Chore: Stop running scheduled tests on forks (#720)

.github/workflows/cron.yml

@@ -0,0 +1,10 @@
+name: Scheduled Tests
+
+on:
+  schedule:
+    - cron: '0 14 * * *'  # Run daily at 14:00 UTC
+
+jobs:
+  tests:
+    if: github.repository_owner == 'pytest-dev'
+    uses: ./.github/workflows/tests.yml

.github/workflows/tests.yml

@@ -5,10 +5,8 @@ on:
     branches:
       - master
 
-  schedule:
-    - cron: '0 14 * * *'  # Run daily at 14:00 UTC
-
   pull_request:
+  workflow_call:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}