Remove cron job workflow for periodic hello message

.gitea/workflows/cron-ci.yml

@@ -1,13 +0,0 @@
-name: Hello Every Minute
-
-on:
-  schedule:
-    - cron: '*/1 * * * *'  # Mỗi 1 phút (UTC)
-  workflow_dispatch:       # Cho phép chạy thủ công
-
-jobs:
-  hello-job:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Print hello
-        run: echo "hello"