Fix release drafter (#9)

Author: famura

.github/workflows/release-drafter.yaml

@@ -0,0 +1,23 @@
+name: Release Drafter
+
+on:
+    push:
+        branches:
+            - main
+    pull_request:
+        types: [opened, reopened, synchronize]
+
+permissions:
+    contents: read
+
+jobs:
+    update_release_draft:
+        name: Update Release Draft
+        runs-on: ubuntu-latest
+        permissions:
+            contents: write
+            pull-requests: write
+        steps:
+            - uses: release-drafter/release-drafter@v6
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}