Add markdown link checker action similar to link checker action in Ma…

…ssa docs

https://github.com/massalabs/docs/pull/157/files/d3499d290c95240b4720aea10c3e32a2bd20b903
Fixes: #3586

.github/workflows/config/link-check.json

@@ -0,0 +1,31 @@
+{
+  "ignorePatterns": [
+      {
+        "pattern": "(localhost|my\\.massa|discord\\.com)"
+      },
+      {
+        "pattern": "^http://manpages.ubuntu.com"
+      },
+      {
+        "pattern": "^https://test.massa.net/api/v2"
+      },
+      {
+        "pattern": "^https://buildnet.massa.net/api/v2"
+      }
+    ],
+    "replacementPatterns": [
+      {
+        "pattern": "^/",
+        "replacement": "https://docs.massa.net/"
+      }
+    ],
+  "timeout": "20s",
+  "retryOn429": true,
+  "retryCount": 5,
+  "fallbackRetryDelay": "30s",
+  "aliveStatusCodes": [
+    200,
+    206,
+    0
+  ]
+}

.github/workflows/link-check.yml

@@ -0,0 +1,25 @@
+name: Check dead links
+
+on:
+  pull_request:
+    branches:
+      - main
+  schedule:
+    - cron: '0 10 * * 6'
+
+jobs:
+  markdown-link-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: '18'
+      - name: Install markdown-link-check
+        run: npm install -g markdown-link-check
+      - name: Check links in markdown files
+        run: |
+          find . \( -name '*.md' -o -name '*.mdx' \) \
+          -exec markdown-link-check -v -c .github/workflows/config/link-check.json --progress {} \; 2>&1 | tee linkcheck.out
+          grep -F -wc "[✖] |ERROR" ./linkcheck.out && exit 1 || true