fix(ci): refine conditions for job execution in test_pyqt5 workflow

Author: PierreRaybaut

.github/workflows/test_pyqt5.yml

@@ -22,11 +22,12 @@ on:
           - 'build_latest'
         default: 'all'
   schedule:
+    # Only the "build_latest" job runs on schedule (see execution conditions below)
     - cron: "0 5 * * 1"
 
 jobs:
   build:
-    if: ${{ github.event_name != 'workflow_dispatch' || github.event.inputs.job_to_run == 'all' || github.event.inputs.job_to_run == 'build' }}
+    if: ${{ (github.event_name == 'push' || github.event_name == 'pull_request') || (github.event_name == 'workflow_dispatch' && (github.event.inputs.job_to_run == 'all' || github.event.inputs.job_to_run == 'build')) }}
 
     env:
       DISPLAY: ':99.0'