Add takanome-dev/assign-issue-action

.github/workflows/assign-issue.yml

@@ -0,0 +1,18 @@
+name: Assign Issue
+
+on:
+  schedule:
+    - cron: 0 0 * * *
+  issue_comment:
+    types: [created]
+  workflow_dispatch:
+
+jobs:
+  assign:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Assign the user or unassign stale assignments
+        uses: takanome-dev/[email protected]
+        with:
+          github_token: '${{ secrets.GITHUB_TOKEN }}'
+          days_until_unassign: 30