Update TagBot.yml

Author: fonsp

.github/workflows/TagBot.yml

@@ -1,20 +1,16 @@
-
-# This GitHub action checks whether a new version of this package
-# has been registred in the official registry.
-# If so, it creates a new _release_:
-# https://github.com/fonsp/PlutoUI.jl/releases
-
 name: TagBot
 on:
   issue_comment:
     types:
       - created
-
-# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+  workflow_dispatch:
+    inputs:
+      lookback:
+        default: "3"
 jobs:
   TagBot:
     if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
-    runs-on: [ubuntu-latest]
+    runs-on: ubuntu-latest
     steps:
       - uses: JuliaRegistries/TagBot@v1
         with: