Add docs.docker.com to markdown link check ignore list

Docker's website blocks automated link checkers (returns status 0),
causing false-positive failures for valid Docker documentation links.

Signed-off-by: Federico Kamelhar <federico.kamelhar@oracle.com>

Author: fede-kamel

ci/markdown-link-check-config.json

@@ -23,6 +23,9 @@
         },
         {
             "pattern": "^https://docs\\.cursor\\.com"
+        },
+        {
+            "pattern": "^https://docs\\.docker\\.com"
         }
     ]
 }