Use new renovate confix

Author: DRSchlaubi

renovate.json

@@ -6,10 +6,18 @@
       "customType": "regex",
       "description": "Update curl Version",
       "fileMatch": ["Dockerfile"],
-      "matchStrings": ["curl-(?<currentValue>\\d+\\.\\d+\\.\\d+)\\.tar\\.gz"],
-      "datasourceTemplate": "github-releases",
+      "matchStrings": ["(?<currentValue>curl-\\d+\\.\\d+\\.\\d+)"],
+      "datasourceTemplate": "custom.curl",
       "depNameTemplate": "curl/curl",
-      "versioningTemplate": "regex:^(?:curl-)?(?<major>\\d+)[_.](?<minor>\\d+)[_.](?<patch>\\d+)$"
+      "versioningTemplate": "regex:curl-(?<major>\\d+)\\.(?<minor>\\d+)\\.(?<patch>\\d+)"
     }
-  ]
+  ],
+  "customDatasources": {
+    "curl": {
+      "defaultRegistryUrlTemplate": "https://api.github.com/repos/curl/curl/releases/latest",
+      "transformTemplates": [
+        "$single(assets, function($item) {$contains($item.name, \".tar.gz\") and ($contains($item.name, \".asc\") != true)}).name"
+      ]
+    }
+  }
 }