Add permissions block to TagBot workflow

Author: joshday

.github/workflows/TagBot.yml

@@ -8,13 +8,17 @@ on:
       lookback:
         description: "[DEPRECATED] No longer has any effect"
         default: "3"
+permissions:
+  actions: read
+  contents: write
+  issues: read
+  pull-requests: read
 jobs:
   TagBot:
     if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
-    runs-on: ubuntu-slim
+    runs-on: ubuntu-latest
     steps:
       - uses: JuliaRegistries/TagBot@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
-          ssh: ${{ secrets.TAGBOT_SSH }}
-          ssh: ${{ secrets.DOCUMENTER_KEY }}
+          ssh: ${{ secrets.TAGBOT_SSH }}