.github: use a new external link checker

.github/exclude-links.txt

@@ -0,0 +1,19 @@
+http://example.com:8033/dashboard/
+https://charts.pingcap.org
+https://download.pingcap.org
+http:/192.168.0.16:2379
+http:/192.168.0.15:2379
+http:/192.168.0.14:2379
+http://spark-master-hostname:8080/
+http:/pd_ip:pd_port
+http:/ip:status_port/config
+http://grafana_ip:3000/
+http://ip:2379/dashboard/
+http://ip:2379/pd/api/v1/members
+http://\$ip:10080/
+http://__tidb_ip__:10080/metrics
+http://__grafana_ip__:3000
+http://9.9.9.9:2379/
+http:/DASHBOARD_IP:PORT/dashboard
+http:/\$%7Btidb-server-ip%7D:\$%7Btidb-server-status-port%7D/
+https://kms.us-west-2.amazonaws.com

.github/workflows/link.yaml

@@ -0,0 +1,31 @@
+name: Links
+
+on:
+  repository_dispatch:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 13 * * 2"
+
+jobs:
+  linkChecker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Link Checker
+        uses: lycheeverse/lychee-action@v1.1.1
+        with:
+          # For parameter description, see https://github.com/lycheeverse/lychee#commandline-parameters
+          args: -E --exclude-mail -v -i -n -a 429 -t 45 --exclude-file ./.github/exclude-links.txt -- **/*.md *.md
+        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: ran-huang
+
+#      - name: Fail if there were link errors
+#        run: exit ${{ steps.lychee.outputs.exit_code }}