Add release drafter (#139)

Author: jacobtomlinson

.github/workflows/release-drafter.yml

@@ -0,0 +1,25 @@
+name: Release Drafter
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  update_release_draft:
+    if: github.repository == 'dask/dask-mpi'
+    permissions:
+      # Write permission is required to create a GitHub release
+      contents: write
+      pull-requests: read
+    runs-on: ubuntu-latest
+    steps:
+      - uses: release-drafter/release-drafter@v5
+        with:
+          disable-autolabeler: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}