chore: update Renovate configuration for Docker host rules

This commit updates the `.github/renovate.json` file to include new host rules for Docker, specifying credentials for `ghcr.io` and `docker.io`. This enhancement improves the configuration for managing Docker dependencies.

Author: roderik

.github/renovate.json

@@ -32,6 +32,18 @@
   "hostRules": [
     {
       "timeout": 3000000
+    },
+    {
+      "hostType": "docker",
+      "matchHost": "ghcr.io",
+      "username": "{{ secrets.GITHUB_USER }}",
+      "password": "{{ secrets.GITHUB_PASS }}"
+    },
+    {
+      "hostType": "docker",
+      "matchHost": "docker.io",
+      "username": "{{ secrets.DOCKER_USER }}",
+      "password": "{{ secrets.DOCKER_PASS }}"
     }
   ]
 }