Use new setup for TagBot

.github/workflows/CompatHelper.yml

@@ -12,3 +12,4 @@ jobs:
         run: julia -e 'using CompatHelper; CompatHelper.main()'
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          COMPATHELPER_PRIV: ${{ secrets.DOCUMENTER_KEY }}

.github/workflows/TagBot.yml

@@ -1,11 +1,15 @@
 name: TagBot
 on:
-  schedule:
-    - cron: 35 17 * * *
+  issue_comment:
+    types:
+      - created
+  workflow_dispatch:
 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 }}