Create a special action to upload version-limited Mac-ARM wheels

For 1.3.2 we built on x86 Mac (macos-13) but it would be good to
have (and test) some ARM wheels as well. We're having trouble building
those on older Python versions, but if we upload 3.10 and 3.11 wheels
to PyPI that should be somewhat useful.

This action is not intended to stick around once py3.8 and 3.9 are
deprecated; then we will try to build intel and ARM wheels in the same
job.

.github/workflows/build_upload_pypi_arm_wheels.yml

@@ -0,0 +1,83 @@
+name: Build and upload PyPI wheels for ARM Mac
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [macos-latest]
+        python-version: ['3.10', '3.11']
+        include:
+          - os: macos-latest
+            wheelname: macos
+          # Build wheels against the lowest compatible Numpy version
+          - python-version: 3.10
+            numpy-version: 1.21.3
+          - python-version: 3.11
+            numpy-version: 1.23.2
+      fail-fast: false
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # Ensure tags are fetched for versioning
+      - name: Setup Python ${{ matrix.python-version }} with Conda
+        uses: conda-incubator/setup-miniconda@v3
+        with:
+          python-version: ${{ matrix.python-version }}
+          channels: conda-forge,defaults
+          channel-priority: true
+      - name: Update Python pip, wheel, and twine
+        shell: bash -l {0}
+        run: |
+          python -m pip install --upgrade pip wheel twine
+      - name: Install llvm on Macos
+        if: startsWith(matrix.os, 'macos')
+        run: brew install llvm
+
+      - name: Build Python wheel
+
+        if: matrix.os != 'ubuntu-latest'
+        shell: bash -l {0}
+        env:
+          NUMPY_VERSION: ${{ matrix.numpy-version }}
+        run: |
+          # Build against lowest required Numpy version
+          python -m pip install numpy==${NUMPY_VERSION}
+          python -m pip wheel . -w wheelhouse --no-deps
+
+      - name: Upload wheels as build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+            name: wheel-${{ matrix.wheelname }}-${{ matrix.python-version }}
+            path: wheelhouse/*-${{ matrix.wheelname }}*.whl
+
+  publish:
+    needs: build
+    name: Upload release to PyPI
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/p/euphonic
+    permissions:
+      id-token: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # This is possibly unnecessary?
+
+      - name: Download artifacts to Ubuntu environment
+        uses: actions/download-artifact@v4
+        with:
+          path: dist/
+          merge-multiple: true
+
+      - name: List Files
+        run: ls -R
+
+      - name: Upload wheels to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1