fix tagbot

Author: Roger-luo

.github/workflows/TagBot.yml

@@ -6,9 +6,10 @@ on:
   workflow_dispatch:
 jobs:
   TagBot:
-    if: github.event_name == 'workflow_dispatch' || github.actor == ''
+    if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
     runs-on: ubuntu-latest
     steps:
       - uses: JuliaRegistries/TagBot@v1
         with:
-          token:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          ssh: ${{ secrets.DOCUMENTER_KEY }}