schedule github action for edxapp schema dump (#25312)

.github/workflows/approve_mysqldbdump_pr.yml

@@ -1,26 +0,0 @@
-# Used to auto approve/merge PRs for mysqldbdump
-name: Automerge mysqldbdump PR
-
-on:
-  pull_request:
-    types:
-      - opened
-      - labeled
-  pull_request_review:
-    types:
-      - submitted
-jobs:
-  approve_and_merge:
-    runs-on: ubuntu-latest
-    if: github.actor == 'edx-deployment' && github.event.label.name == 'mysqldbdump'
-    steps:
-      - uses: hmarr/auto-approve-action@7782c7e2bdf62b4d79bdcded8332808fd2f179cd
-        with:
-          github-token: "${{ secrets.GITHUB_TOKEN }}"
-      - name: automerge
-        uses: "pascalgn/automerge-action@7ab42e888a333bf77ce865bc84fedc6a365a3548"
-        env:
-          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
-          MERGE_LABELS: "mysqldbdump"
-          MERGE_FILTER_AUTHOR: "edx-deployment"
-          MERGE_METHOD: "merge"

.github/workflows/mysqldbdump.yml

@@ -1,8 +1,7 @@
 name: mysqldbdump
 on:
-  push:
-    branches:
-      - 'master'
+  schedule:
+    - cron: '0 8 * * *'
 jobs:
   mysqldbdump:
     name: mysqldbdump