use custom golang version

Signed-off-by: eternal-flame-AD <[email protected]>

renovate.json

@@ -25,7 +25,15 @@
       ],
       "depNameTemplate": "go",
       "autoReplaceStringTemplate": "{{{newValue}}}",
-      "datasourceTemplate": "golang-version"
+      "datasourceTemplate": "custom.golang-version"
     }
-  ]
+  ],
+  "customDatasources": {
+    "golang-version": {
+      "defaultRegistryUrlTemplate": "https://go.dev/dl/?mode=json&include=all",
+      "transformTemplates": [
+        "{ \"releases\": $[stable = true].{ \"version\": $split(version, \"go\")[1] }, \"sourceUrl\": \"https://github.com/golang/go\", \"homepage\": \"https://go.dev/\", \"changelogUrl\": \"https://go.dev/doc/devel/release\" }"
+      ]
+    }
+  }
 }