make renovate configs more restrictive in their scope

apps/immich/renovate.json

@@ -1,10 +1,10 @@
 {
-    "packageRules": [
-      {
-        "matchDatasources": ["docker"],
-        "matchPackagePrefixes": ["ghcr.io/immich-app/"],
-        "groupName": "Immich containers",
-        "groupSlug": "immich-app-images"
-      }
-    ]
-  }
+  "packageRules": [
+    {
+      "matchDatasources": ["docker"],
+      "matchPackagePrefixes": ["ghcr.io/immich-app/"],
+      "groupName": "Immich containers",
+      "groupSlug": "immich-app-images"
+    }
+  ]
+}

infrastructure/external-dns/renovate.json

@@ -8,6 +8,7 @@
   "packageRules": [
     {
       "matchDatasources": ["docker"],
+      "matchPackageNames": ["git.kluster.moll.re/remoll/dns"],
       "versioning": "regex:^(?<major>\\d+)\\.(?<minor>\\d+)\\.(?<patch>\\d+)-build.(?<build>\\d+)$"
     }
   ]