.github: add external link checker (#850)

.github/exclude-links.txt

@@ -0,0 +1,4 @@
+http:/127.0.0.1
+http:/192.168.0.4
+http:/192.168.0.5
+http:/192.168.0.6

.github/workflows/link.yaml

@@ -0,0 +1,28 @@
+name: Links
+
+on:
+  repository_dispatch:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * 1"
+
+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
+        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: shichun-0415

README.md

@@ -9,10 +9,10 @@ Currently, the official documentation supports two languages:
 
 You can use Google Translate to view the documentation in different languages. For example:
 
-- `fr`: [documentation in French](http://translate.google.com/translate?hl=en&sl=en&tl=fr&u=https%3A%2F%2Fgithub.com%2Fpingcap%2Fdocs-dm%2Fblob%2Fmaster%2Fen%2FTOC.md)
-- `ja`: [documentation in Japanese](http://translate.google.com/translate?hl=en&sl=en&tl=ja&u=https%3A%2F%2Fgithub.com%2Fpingcap%2Fdocs-dm%2Fblob%2Fmaster%2Fen%2FTOC.md)
-- `ko`: [documentation in Korean](http://translate.google.com/translate?hl=en&sl=en&tl=ko&u=https%3A%2F%2Fgithub.com%2Fpingcap%2Fdocs-dm%2Fblob%2Fmaster%2Fen%2FTOC.md)
-- `id`: [documentation in Indonesian](http://translate.google.com/translate?hl=en&sl=en&tl=id&u=https%3A%2F%2Fgithub.com%2Fpingcap%2Fdocs-dm%2Fblob%2Fmaster%2Fen%2FTOC.md)
+- `fr`: [documentation in French](https://translate.google.com/translate?hl=en&sl=en&tl=fr&u=https%3A%2F%2Fgithub.com%2Fpingcap%2Fdocs-dm%2Fblob%2Fmaster%2Fen%2FTOC.md)
+- `ja`: [documentation in Japanese](https://translate.google.com/translate?hl=en&sl=en&tl=ja&u=https%3A%2F%2Fgithub.com%2Fpingcap%2Fdocs-dm%2Fblob%2Fmaster%2Fen%2FTOC.md)
+- `ko`: [documentation in Korean](https://translate.google.com/translate?hl=en&sl=en&tl=ko&u=https%3A%2F%2Fgithub.com%2Fpingcap%2Fdocs-dm%2Fblob%2Fmaster%2Fen%2FTOC.md)
+- `id`: [documentation in Indonesian](https://translate.google.com/translate?hl=en&sl=en&tl=id&u=https%3A%2F%2Fgithub.com%2Fpingcap%2Fdocs-dm%2Fblob%2Fmaster%2Fen%2FTOC.md)
 
 ## Documentation versions