cron nightly

.github/workflows/nightly-wheel-build.yml

@@ -1,31 +1,34 b''
 name: Nightly Wheel builder
 on:
   workflow_dispatch:
+  schedule:
+    # this cron is ran every Sunday at midnight UTC
+    - cron: '0 0 * * 0'
 
 jobs:
   upload_anaconda:
     name: Upload to Anaconda
     runs-on: ubuntu-latest
     # The artifacts cannot be uploaded on PRs
     if: github.event_name != 'pull_request'
 
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
           python-version: "3.10"
           cache: pip
           cache-dependency-path: |
             setup.cfg
       - name: Try building with Python build
         if: runner.os != 'Windows'  # setup.py does not support sdist on Windows
         run: |
           python -m pip install build
           python -m build
 
       - name: Upload wheel
         uses: scientific-python/upload-nightly-action@main
         with:
           artifacts_path: dist
           anaconda_nightly_upload_token: ${{secrets.UPLOAD_TOKEN}}