CI: use tags to designate a release

.github/workflows/ci-build.yml

@@ -31,6 +31,7 @@ defaults:
 
 env:
   PYTHONUNBUFFERED: 1
+  WXPYTHON_BUILD_ARGS: ${{ startsWith(github.ref, 'refs/tags/') && '--release' || '' }}
 
 #---------------------------------------------------------------------------
 
@@ -197,9 +198,9 @@ jobs:
           path: dist/wxPython-*.whl
 
 
-  publish-to-testpypi:
-    name: Publish Python distribution to TestPyPI
-    if: github.event_name != 'pull_request'
+  publish-to-pypi:
+    name: Publish Python distribution to PyPI
+    if: startsWith(github.ref, 'refs/tags/')
     needs: build-wheels
     runs-on: ubuntu-22.04
 
@@ -216,7 +217,7 @@ jobs:
       with:
         path: dist/
         merge-multiple: true
-    - name: Publish distribution to TestPyPI
+    - name: Publish distribution to PyPI
       uses: pypa/gh-action-pypi-publish@release/v1
       with:
         repository-url: https://test.pypi.org/legacy/