Merge pull request #306 from jverzani/tagbot

use https://github.com/JuliaRegistries/TagBot/blob/master/example.yml

Author: jverzani

.github/workflows/TagBot.yml

@@ -1,11 +1,23 @@
 name: TagBot
 on:
-  schedule:
-    - cron: 0 0 * * *
+  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 }}
+          # For commits that modify workflow files: SSH key enables tagging, but
+          # releases require manual creation. For full automation of such commits,
+          # use a PAT with `workflow` scope instead of GITHUB_TOKEN.
+          # See: https://github.com/JuliaRegistries/TagBot#commits-that-modify-workflow-files
+          ssh: ${{ secrets.DOCUMENTER_KEY }}
+          # ssh: ${{ secrets.NAME_OF_MY_SSH_PRIVATE_KEY_SECRET }}