Create GitHub release from tag

.github/workflows/create-release.yml

@@ -0,0 +1,18 @@
+name: Create release
+
+on:
+  push:
+    tags:
+    - '*'
+
+jobs:
+  create-release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          body: "Changelog: https://www.sphinx-doc.org/en/master/changes.html"