workflow: move committing workflows to schedule (#4529)

This moves all workflows that commit to a schedule, so that it _doesn't_
push into peoples PRs as that enlarges them and is just non-obvious.

They run throughout the week.

Also change the "user" we use for this, so that DCO believes it a real
email address (DCO is pretty stupid here). Update the authors target to
filter out this bot as well.

Signed-off-by: Miek Gieben <miek@miek.nl>

.github/workflows/whitespace.yml

@@ -1,11 +1,8 @@
 name: Remove Trailing Whitespaces
 
 on:
-  push:
-    branches:
-      - 'master'
-    paths-ignore:
-      - '**.go'
+  schedule:
+    - cron: '22 10 * * 2'
 
 jobs:
   fix:
@@ -23,8 +20,8 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          git config user.name "coredns-auto-trailing-whitespaces[bot]"
-          git config user.email "coredns-auto-trailing-whitespaces[bot]@users.noreply.github.com"
+          git config user.name "coredns[bot]"
+          git config user.email "bot@bot.coredns.io"
           git remote set-url origin https://x-access-token:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git
       -
         name: Commit and push changes