add reactivation step

.github/workflows/stale.yml

@@ -1,6 +1,8 @@
 name: stale
 on:
-  schedule: [cron: "0 1 * * 1"]
+  workflow_dispatch:
+  schedule:
+    - cron: "0 1 * * MON"
 jobs:
   main:
     runs-on: ubuntu-latest
@@ -9,3 +11,9 @@ jobs:
         with:
           stale-issue-message: このIssueは最終更新日から365日以上経過しています。
           days-before-stale: 365
+      - name: Reactivation
+        run: |
+          gh workflow disable --repo "${GITHUB_REPOSITORY}" "${GITHUB_WORKFLOW}"
+          gh workflow enable --repo "${GITHUB_REPOSITORY}" "${GITHUB_WORKFLOW}"
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}