Validate all links every day at 00:00 (#1414)

Co-authored-by: Yann Bertrand <5855339+yannbertrand@users.noreply.github.com>

.github/workflows/validate_links.yml

@@ -0,0 +1,19 @@
+name: "Validate links"
+
+on:
+  schedule:
+    - cron:  '0 0 * * *'
+
+env:
+  FORMAT_FILE: README.md
+
+jobs:
+  test:
+    name: 'Validate README.md'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Validate all links from README.md
+        run: build/validate_links.sh ${FORMAT_FILE}