Run cron jobs only for scheduled main and for tags

Author: bsipocz

.github/workflows/ci_crontests.yml

@@ -2,13 +2,9 @@ name: CI-crontests
 
 on:
   push:
-    branches:
-    - main
+    # Run this job on release tags, but not on pushes to the main branch
     tags:
     - '*'
-  pull_request:
-    branches:
-    - main
   schedule:
     # run every Monday at 5am UTC
     - cron: '0 5 * * 1'
@@ -17,7 +13,7 @@ jobs:
   tests:
     name: ${{ matrix.name }}
     runs-on: ${{ matrix.os }}
-#    if: github.event_name == 'schedule' && github.repository == 'astropy/astroquery'
+    if: github.event_name == 'schedule' && github.repository == 'astropy/astroquery'
     strategy:
       fail-fast: true
       matrix: