Add checks (#1587)

.github/workflows/validate-external-links.yml

@@ -1,6 +1,7 @@
 name: External link validation
 
 on:
+  workflow_dispatch:
   schedule:
     - cron: 0 11 * * *
 
@@ -11,7 +12,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: lychee Link Checker
         id: lychee
-        uses: lycheeverse/lychee-action@v1.9.3
+        uses: lycheeverse/lychee-action@v2.1.0
         with:
           fail: true
           args: --accept=200,403,429 -s "https"  "**/*.html" "**/*.md" "**/*.txt" "**/*.json" --exclude "https://github.com/\[your*" --exclude "https://localhost:9200" --exclude-mail

.lycheeignore

@@ -0,0 +1 @@
+https://example.es/