INTPYTHON-589 Fix PyPI upload conditional (#70)

Author: blink1073

.github/workflows/release-python.yml

@@ -80,9 +80,9 @@ jobs:
       with:
         repository-url: https://test.pypi.org/legacy/
         skip-existing: true
-        attestations: ${{ !startsWith(github.ref, 'refs/tags/') }}
+        attestations: ${{ env.DRY_RUN }}
     - name: Publish distribution 📦 to PyPI
-      if: startsWith(github.ref, 'refs/tags/')
+      if: startsWith(env.DRY_RUN, 'false')
       uses: pypa/gh-action-pypi-publish@release/v1
 
   post-publish: