update tagbot

Author: sjkelly

.github/workflows/TagBot.yml

@@ -1,12 +1,15 @@
 name: TagBot
 on:
-  schedule:
-    - cron: 0 0 * * 0
+  issue_comment:
+    types:
+      - created
+  workflow_dispatch:
 jobs:
   TagBot:
+    if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
       - uses: JuliaRegistries/TagBot@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
+          ssh: ${{ secrets.DOCUMENTER_KEY }}