chore: add GitHub Actions

.github/workflows/schedule.yml

@@ -0,0 +1,18 @@
+name: 'schedule'
+
+on:
+  schedule:
+    - cron: '0 0,6,12,18 * * *'
+
+jobs:
+  gitee:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: ttionya/Repository-Sync-Hub@v1
+      with:
+        target_repository: 'https://gitee.com/ttionya/BitwardenRS-Backup.git'
+        http_access_name: 'ttionya'
+        http_access_token: ${{ secrets.GITEE_HTTP_ACCESS_TOKEN }}