add github action for building packages

copied from pydqed, see: https://github.com/ReactionMechanismGenerator/PyDQED/blob/9377ec27f08a124ada3ef2cb701d48f2383e6693/.github/workflows/build_package.yml

.github/workflows/build_package.yml

@@ -0,0 +1,74 @@
+name: Build Package
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  pull_request:
+  workflow_dispatch:
+  push:
+    branches:
+      - stable
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-13, macos-latest]
+        numpy-version: ["1.21", "1.22", "1.23", "1.24", "1.25", "1.26", "2.0"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        exclude:
+          - numpy-version: "1.21"
+            python-version: "3.10"
+          - numpy-version: "1.21"
+            python-version: "3.11"
+          - numpy-version: "1.22"
+            python-version: "3.11"
+          - numpy-version: "1.21"
+            python-version: "3.12"
+          - numpy-version: "1.22"
+            python-version: "3.12"
+          - numpy-version: "1.23"
+            python-version: "3.12"
+          - numpy-version: "1.24"
+            python-version: "3.12"
+          - numpy-version: "1.25"
+            python-version: "3.12"
+    runs-on: ${{ matrix.os }}
+    name: Build ${{ matrix.os }} Python ${{ matrix.python-version }} Numpy ${{ matrix.numpy-version }}
+    defaults:
+      run:
+        shell: bash -l {0}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Conda
+        uses: conda-incubator/setup-miniconda@v3
+        with:
+          auto-update-conda: false
+          conda-solver: libmamba
+          auto-activate-base: true
+          activate-environment: ""
+      - name: Install Build Tools
+        run: conda install python anaconda-client conda-build
+      - name: Configure Auto-Upload
+        if: github.ref == 'refs/heads/stable'
+        run: |
+          conda config --set anaconda_upload yes
+      - name: Build Binary
+        run: |
+          # set a default value to the conda_token if needed (like from forks)
+          : "${CONDA_TOKEN:=${{ secrets.ANACONDA_TOKEN }}}"
+          : "${CONDA_TOKEN:=default_value}"
+          echo "CONDA_TOKEN=$CONDA_TOKEN" >> $GITHUB_ENV
+          conda config --add channels conda-forge
+          CONDA_NPY=${{ matrix.numpy-version }} CONDA_PY=${{ matrix.python-version }} conda build --token $CONDA_TOKEN --user rmg .
+  result:
+    if: ${{ always() }}
+    runs-on: ubuntu-latest
+    name: Final Results
+    needs: [build]
+    steps:
+      - run: exit 1
+        # see https://github.com/orgs/community/discussions/26822?sort=new#discussioncomment-8285141
+        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') || contains(needs.*.result, 'skipped') }}