renovate: Add custom config

* renovate: Add custom config for super linter
* renovate: Update custom manager for super-linter

Author: pataxis

.github/renovate.json

@@ -6,6 +6,10 @@
     "labels": ["dependencies"],
     "ignorePaths": ["container-example/**"],
     "packageRules": [
+        {
+            "groupName": "Update of files using super-linter",
+            "matchFileNames": ["LINT.md", "run-linters", ".github/workflows/linter.y(a)?ml" ]
+        },
         {
             "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
             "automerge": true
@@ -15,6 +19,16 @@
             "enabled": false
         }
     ],
+  "customManagers": [
+    {
+      "customType": "regex",
+      "description": "Update super-linter",
+      "fileMatch": ["LINT.md", "run-linters"],
+      "depNameTemplate": "docker",
+      "datasourceTemplate": "docker",
+      "matchStrings": [".*ghcr.io/super-linter/super-linter:(?<currentValue>.*?)\\n"]
+    }
+  ],
     "rebaseWhen": "behind-base-branch",
     "vulnerabilityAlerts": {
         "labels": ["security"]