test on PR first

Author: mmcky

.github/workflows/execution.yml

@@ -1,8 +1,8 @@
 name: Run Execution Tests [Latest Anaconda]
 on: push
-  schedule:
-    # UTC 22:00 is early morning in Australia
-    - cron:  '0 22 * * *'
+  # schedule:
+  #   # UTC 22:00 is early morning in Australia
+  #   - cron:  '0 22 * * *'
 jobs:
   execution-tests-linux-osx:
     name: Execution Tests (${{ matrix.python-version }}, ${{ matrix.os }})