Add some missing files from the template

.github/CODEOWNERS

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+* @MarcelCoding @SuperSandro2000

.github/renovate.json

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended",
+    "default:pinDigestsDisabled",
+    "mergeConfidence:all-badges"
+  ],
+  "assignees": [
+    "MarcelCoding",
+    "SuperSandro2000"
+  ],
+  "dependencyDashboardOSVVulnerabilitySummary": "all",
+  "nix": {
+    "enabled": true
+  },
+  "osvVulnerabilityAlerts": true,
+  "packageRules": [
+    {
+      "matchManagers": ["nix"],
+      "groupName": "flake inputs"
+    }
+  ],
+  "prHourlyLimit": 0,
+  "schedule": [
+    "before 12am on sunday"
+  ],
+  "semanticCommits": "disabled"
+}

.github/workflows/post-compare-link.yaml

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+name: Post compare link when flake.lock changes
+
+permissions:
+  issues: write
+  pull-requests: write
+
+on:
+  pull_request:
+    paths: ['flake.lock']
+
+jobs:
+  post-compare-link:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: NuschtOS/flake-lock-compare-action@main