Add a publishing step WIP

.github/workflows/publish.yml

@@ -0,0 +1,78 @@
+name: Publish
+on: push
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install build
+        run: python3 -m pip install build --user
+
+      - name: Build sdist/wheel
+        run: python3 -m build
+
+      - name: Store
+        uses: actions/upload-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+
+  publish-to-pypi:
+    name: Publish
+    if: startsWith(github.ref, 'refs/tags/')
+    needs:
+      - build
+    runs-on: ubuntu-latest
+
+    environment:
+      name: pypi
+      url: https://pypi.org/p/xspec-models-cxc-helpers
+
+    permissions:
+      id-token: write
+
+    steps:
+      - name: Download dist
+        uses: actions/download-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+
+
+  publish-to-testpypi:
+    name: Publish (TestPyPI)
+    if: startsWith(github.ref, 'skip/all/runs/for/now/')
+    needs:
+      - build
+    runs-on: ubuntu-latest
+
+    environment:
+      name: testpypi
+      url: https://test.pypi.org/p/xspec-models-cxc-helpers
+
+    permissions:
+      id-token: write
+
+    steps:
+      - name: Download dist
+        uses: actions/download-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          repository-url: https://test.pypi.org/legacy/