Fix publish workflow to build package before publishing

Author: Alex J Lennon

.github/workflows/publish.yml

@@ -20,12 +20,21 @@ jobs:
       id-token: write  # IMPORTANT: this permission is needed for trusted publishing
 
     steps:
-    - name: Download all dists
-      uses: actions/download-artifact@v4
+    - uses: actions/checkout@v4
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
       with:
-        name: python-package-distributions
-        path: dist/
-        github-token: ${{ secrets.GITHUB_TOKEN }}
+        python-version: "3.10"
+
+    - name: Install build tools
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install build
+
+    - name: Build package
+      run: |
+        python -m build
 
     - name: Publish package to PyPI
       uses: pypa/gh-action-pypi-publish@release/v1