set cron trigger; set shichun as assignee

Signed-off-by: Ran <huangran@pingcap.com>

.github/workflows/link.yaml

@@ -1,10 +1,10 @@
 name: Links
 
-on: [pull_request]
-#  repository_dispatch:
-#  workflow_dispatch:
-#  schedule:
-#    - cron: "0 0 * * 1"
+on:
+  repository_dispatch:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * 1"
 
 jobs:
   linkChecker:
@@ -20,12 +20,9 @@ jobs:
         env:
           GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
 
-#      - name: Create Issue From File
-#        uses: peter-evans/create-issue-from-file@v3
-#        with:
-#          title: Broken Link Detected
-#          content-filepath: ./lychee/out.md
-#          assignees: TomShawn
-
-#      - name: Fail if there were link errors
-#        run: exit ${{ steps.lychee.outputs.exit_code }}
+      - name: Create Issue From File
+        uses: peter-evans/create-issue-from-file@v3
+        with:
+          title: Broken Link Detected
+          content-filepath: ./lychee/out.md
+          assignees: shichun-0415