GitHub Actions: add workflow definition to produce release artifacts

.github/workflows/release.yml

@@ -0,0 +1,24 @@
+name: Create Release Artifacts
+
+on:
+  - workflow_dispatch
+
+jobs:
+  wheels:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+
+    - name: create Python wheel and sdist
+      run: |
+        python setup.py sdist bdist_wheel
+
+    - name: upload release artifacts
+      uses: actions/upload-artifact@v4
+      with:
+        name: "release-artifacts"
+        path: dist/*
+        if-no-files-found: error