CI: add nightly wheel uploads to anaconda.org

Author: rgommers

.github/workflows/wheels.yml

@@ -149,6 +149,37 @@ jobs:
           name: ${{ matrix.python }}-${{ matrix.buildplat[1] }}-${{ matrix.buildplat[2] }}
           path: ./dist/*.whl
 
+      # We upload nightlies only on cron job runs, so it doesn't overlap with
+      # builds from which we publish to PyPI - we don't want these extra
+      # dependencies when building release artifacts.
+      - name: install micromamba
+        # win-arm64 is unsupported by micromamba at the moment
+        if: github.event_name == 'schedule' && matrix.buildplat[1] != 'win_arm64'
+        uses: mamba-org/setup-micromamba@b09ef9b599704322748535812ca03efb2625677b
+        with:
+          # For installation of anaconda-client, required for upload to anaconda.org
+          init-shell: bash
+          environment-name: upload-env
+          create-args: >-
+            anaconda-client
+
+      - name: win-arm64 install anaconda client
+        if: github.event_name == 'schedule' && matrix.buildplat[1] == 'win_arm64'
+        run: |
+          # Rust installation needed for rpds-py.
+          Invoke-WebRequest https://static.rust-lang.org/rustup/dist/aarch64-pc-windows-msvc/rustup-init.exe -UseBasicParsing -Outfile rustup-init.exe
+          .\rustup-init.exe -y
+          $env:PATH="$env:PATH;$env:USERPROFILE\.cargo\bin"
+          pip install anaconda-client
+
+      - name: Upload to anaconda.org
+        if: github.event_name == 'schedule' && github.repository == 'numpy/numpy-release'
+        shell: bash -el {0}  # required for micromamba
+        env:
+          TOKEN: ${{ secrets.NUMPY_NIGHTLY_UPLOAD_TOKEN }}
+        run: |
+          anaconda -q -t ${TOKEN} upload --force -u scientific-python-nightly-wheels ./dist/*.whl
+
   build_sdist:
     name: Build sdist
     runs-on: ubuntu-latest