Update TagBot to use issue comment triggers

Author: gnadt

.github/workflows/TagBot.yml

@@ -1,14 +1,20 @@
 name: TagBot
 
 on:
-  schedule:
-    - cron: 00 11 * * *
+  issue_comment:
+    types:
+      - created
+  workflow_dispatch:
+    inputs:
+      lookback:
+        default: "3"
 
 jobs:
   TagBot:
+    if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
     runs-on: ubuntu-latest
     steps:
       - uses: JuliaRegistries/TagBot@v1
         with:
-            token: ${{ secrets.GITHUB_TOKEN }}
-            ssh: ${{ secrets.DOCUMENTER_KEY }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+          ssh: ${{ secrets.DOCUMENTER_KEY }}