Add override-args to workflow-dispatch

.github/workflows/check-links.yml

@@ -25,6 +25,10 @@ on:
         description: Message to display in job summary
         required: false
         type: string
+      override-args:
+        description: Override default arguments (see https://github.com/lycheeverse/lychee#commandline-parameters)
+        required: false
+        type: string
       exclude:
         description: URLs excluded from checking (need to include '--exclude' option text in string if using)
         required: false