Update catalog.json to add MegaLinter Custom Flavor (SchemaStore#4872)

Author: nvuillam

src/api/json/catalog.json

@@ -3610,6 +3610,12 @@
       ],
       "url": "https://raw.githubusercontent.com/megalinter/megalinter/main/megalinter/descriptors/schemas/megalinter-configuration.jsonschema.json"
     },
+    {
+      "name": "MegaLinter Custom Flavor",
+      "description": "MegaLinter Custom Flavor definition file",
+      "fileMatch": ["megalinter-custom-flavor.yml"],
+      "url": "https://raw.githubusercontent.com/megalinter/megalinter/main/megalinter/descriptors/schemas/megalinter-custom-flavor.jsonschema.json"
+    },
     {
       "name": "MegaLinter descriptor",
       "description": "MegaLinter descriptor files (for MegaLinter contributors)",