Set up uploading non-compiled nightly wheels twice weekly

.github/workflows/nightly-wheels.yml

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+# Workflow to build non-compiled nightly wheel.
+
+name: Nightly wheels
+on:
+  schedule:
+  #        ┌───────────── minute (0 - 59)
+  #        │  ┌───────────── hour (0 - 23)
+  #        │  │ ┌───────────── day of the month (1 - 31)
+  #        │  │ │ ┌───────────── month (1 - 12 or JAN-DEC)
+  #        │  │ │ │ ┌───────────── day of the week (0 - 6 or SUN-SAT)
+  #        │  │ │ │ │
+  - cron: "42 1 * * 0,3"
+  pull_request:
+    types: [labeled, opened, synchronize, reopened]
+    paths:
+      #- Cython/Build/**
+      - .github/workflows/nightly-wheels.yml
+      - pyproject.toml
+      - MANIFEST.in
+      - setup.*
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
+build_pure_wheel:
+    name: Build pure wheel and upload to Anaconda's PyPI
+    if: >-
+      github.event_name == 'schedule' ||
+      github.event_name == 'workflow_dispatch' ||
+      (github.event_name == 'pull_request' &&
+      contains(github.event.pull_request.labels.*.name, 'Build System'))
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Cython
+        uses: actions/[email protected]
+
+      - uses: deadsnakes/[email protected]
+        with:
+          python-version: 3.13-dev
+          nogil: true
+
+      - name: Build pure wheel
+        run: |
+          pip install --upgrade wheel setuptools
+          python setup.py bdist_wheel --no-cython-compile
+
+      - uses: actions/[email protected]
+        with:
+          name: pure-wheel
+          path: ./dist/*.whl
+
+      - uses: conda-incubator/[email protected]
+        with:
+          # for installation of anaconda-client, required for upload to
+          # anaconda.org
+          # default (and activated) environment name is test
+          # Note that this step is *after* specific pythons have been used to
+          # build
+          auto-update-conda: true
+          python-version: "3.10"
+
+      - name: Upload wheels to scientific-python-nightly-wheels
+        if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
+        shell: bash -el {0}
+        # see https://github.com/marketplace/actions/setup-miniconda for why
+        # `-el {0}` is required.
+        env:
+          TOKEN: ${{ secrets.NUMPY_NIGHTLY_UPLOAD_TOKEN }}
+        run: |
+          source Tools/upload-wheels.sh
+          # trigger an upload to
+          # https://anaconda.org/scientific-python-nightly-wheels/numpy
+          # for cron jobs or "Run workflow" (restricted to main branch).
+          # The tokens were originally generated at anaconda.org
+          upload_wheels

Tools/upload-wheels.sh

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+upload_wheels() {
+    echo ${PWD}
+    if [[ -z ${TOKEN} ]]; then
+        echo no token set, not uploading
+    else
+        if compgen -G "./dist/*.whl"; then
+            echo "Found wheel"
+            anaconda -q -t ${TOKEN} upload --force -u scientific-python-nightly-wheels ./dist/*.whl
+            echo "PyPI-style index: https://pypi.anaconda.org/scientific-python-nightly-wheels/simple"
+        else
+            echo "Files do not exist"
+            return 1
+        fi
+    fi
+}