ci(pypi): Improves PyPI publishing workflow

.github/workflows/pypi.yaml

@@ -2,19 +2,15 @@ name: Publish package to PyPi
 # See https://docs.pypi.org/trusted-publishers/adding-a-publisher/
 
 on:
-  push:
-    tags:
-      - v*
+  pull_request:
+    branches:
+      - main
   workflow_dispatch: # Uncomment line if you also want to trigger action manually
 
-permissions:
-  id-token: write
-
 jobs:
-  build-release:
+  build:
+    name: Build Package
     runs-on: ubuntu-latest
-    environment: pypi-publish
-    name: Publish package to PyPi
     steps:
       - uses: actions/checkout@v4
         with:
@@ -25,15 +21,62 @@ jobs:
           python-version: 3.11
       - name: Installing the package
         run: |
-          pip3 install .
           pip3 install .[pypi]
       - name: Build package
         run: |
           pip3 install --upgrade setuptools
           export DEB_PYTHON_INSTALL_LAYOUT=deb_system
           python -m build --no-isolation
-      - name: Publish package to PyPI
+      - name: Store the distribution packages
+        uses: actions/upload-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+
+  publish-to-pypi:
+    name: Publish Python 🐍 distribution 📦 to PyPI
+    if: startsWith(github.ref, 'refs/tags/') # only publish to PyPI on tag pushes
+    needs:
+      - build
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+    environment:
+      name: pypi-publish
+      url: https://pypi.org/p/topostats
+    steps:
+      - name: Download all the dists
+        uses: actions/download-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+
+      - name: Publish distribution 📦 to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
         with:
           user: __token__
           password: ${{ secrets.PYPI_API_TOKEN }}
+
+  # publish-to-testpypi:
+  #   name: Publish Python 🐍 distribution 📦 to TestPyPI
+  #   needs:
+  #     - build
+  #   runs-on: ubuntu-latest
+
+  #   environment:
+  #     name: testpypi
+  #     url: https://test.pypi.org/p/topostats
+
+  #   permissions:
+  #     id-token: write # IMPORTANT: mandatory for trusted publishing
+
+  #   steps:
+  #     - name: Download all the dists
+  #       uses: actions/download-artifact@v4
+  #       with:
+  #         name: python-package-distributions
+  #         path: dist/
+  #     - name: Publish distribution 📦 to TestPyPI
+  #       uses: pypa/gh-action-pypi-publish@release/v1
+  #       with:
+  #         repository-url: https://test.pypi.org/legacy/