Add hostRule for internal fetching

Renovate communicates with the API over the local port, but gets the public clone url back. 
Use a hostrule to override the public adress with the internal one

config.js

@@ -10,4 +10,13 @@ module.exports = {
 		"$schema": "https://docs.renovatebot.com/renovate-schema.json"
 	},
     "optimizeForDisabled": true,
+    hostRules: [
+        {
+            matchHost: "git.akumatic.eu",
+            hostType: "gitea",
+            resolveHost: "server",
+            protocol: "http",
+            port: 3000
+        }
+    ]
 };