Add CompatHelper and reduce frequency of TagBot to once per day

.github/workflows/CompatHelper.yml

@@ -0,0 +1,14 @@
+name: CompatHelper
+on:
+  schedule:
+    - cron: 31 15 * * *
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Pkg.add("CompatHelper")
+        run: julia -e 'using Pkg; Pkg.add("CompatHelper")'
+      - name: CompatHelper.main()
+        run: julia -e 'using CompatHelper; CompatHelper.main()'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/TagBot.yml

@@ -1,7 +1,7 @@
 name: TagBot
 on:
   schedule:
-    - cron: 0 * * * *
+    - cron: 27 15 * * *
 jobs:
   TagBot:
     runs-on: ubuntu-latest