add initial workflows config

Author: weaverba137

.github/workflows/python-package.yml

@@ -0,0 +1,56 @@
+# Workflow is based on the Astropy GitHub actions workflow, ci_workflows.yml
+name: CI
+
+on:
+    push:
+        branches:
+            - '*'
+        tags:
+            - '*'
+    pull_request:
+
+
+# 2025-01-07
+# NERSC has Python 3.10, Numpy 1.22.4, Scipy 1.8.1, matplotlib 3.8.4, astropy 6.0.1, healpy 1.16.6, PyYAML 6.0.1
+# PyPI has Python 3.13, Numpy 2.2.1, Scipy 1.15.0, matplotlib 3.10.0, astropy 7.0.0, healpy 1.18.0, PyYAML 6.0.2
+# Numpy 1.26.4 was the last pre-2.0 Numpy.
+#
+jobs:
+    tests:
+        name: Unit tests
+        runs-on: ${{ matrix.os }}
+        strategy:
+            fail-fast: false  # reset to true after Astropy 7 issues are resolved.
+            matrix:
+                include:
+                    # Stable, yet close to bleeding-edge.
+                    # - os: ubuntu-latest
+                    #   python-version: '3.13'
+                    #   numpy-version: '<3.0'
+                    # - os: ubuntu-latest
+                    #   python-version: '3.12'
+                    #   numpy-version: '<2.2'
+                    # - os: ubuntu-latest
+                    #   python-version: '3.11'
+                    #   numpy-version: '<2.1'
+                    # Similar to NERSC but more recent NumPy.
+                    - os: ubuntu-latest
+                      python-version: '3.10'
+                      numpy-version: '<2.0'
+
+        steps:
+            - name: Checkout code
+              uses: actions/checkout@v5
+            - name: Set up Python ${{ matrix.python-version }}
+              uses: actions/setup-python@v6
+              with:
+                python-version: ${{ matrix.python-version }}
+            - name: Install Python dependencies
+              run: |
+                python -m pip install --upgrade pip setuptools wheel
+                python -m pip install --upgrade --upgrade-strategy only-if-needed "numpy${{ matrix.numpy-version }}"
+                python -m pip install desiutil fitsio
+                python -m pip install --editable .
+            - name: Run the test
+              run: pytest
+