update tagbot yml

Author: chengchingwen

.github/workflows/TagBot.yml

@@ -1,9 +1,9 @@
 name: TagBot
 on:
- issue_comment:
+  issue_comment:
     types:
       - created
- workflow_dispatch:
+  workflow_dispatch:
 jobs:
   TagBot:
     if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
@@ -12,3 +12,4 @@ jobs:
       - uses: JuliaRegistries/TagBot@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
+          ssh: ${{ secrets.DOCUMENTER_KEY }}