chore: Add missing discussions: write permission to release job (#81)

## What's Changed

We need `discussions: write` permission to create a new discussion by
`gh release create --discussion-category`.

Closes #80.

Author: kou

.github/workflows/release.yaml

@@ -25,6 +25,7 @@ on:
 
 permissions:
   contents: write
+  discussions: write
 
 env:
   GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}