add TagBot

Author: simonbyrne

.github/workflows/tagbot.yml

@@ -0,0 +1,12 @@
+name: TagBot
+on:
+  schedule:
+    - cron: 0 0 * * *
+  workflow_dispatch:
+jobs:
+  TagBot:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: JuliaRegistries/TagBot@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}