Set up Renovate configuration with default and Docker-specific presets. Updated bot settings and added README.

.gitignore

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+.idea

README.md

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+# Renovate Configuration
+
+Base Renovate configuration for the self-hosted Gitea instance at `spenke-nordic.com`.
+
+## Usage
+
+Extend this configuration in your repository's `renovate.json`:
+
+```json
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "local>paulspenke/renovate-config:default"
+  ]
+}
+```
+
+## Presets
+
+- `default`: Base configuration with standard rules.
+- `docker`: Specific rules for Docker images.
+- `npm`: Specific rules for Node.js packages.
+- `github-actions`: Rules for GitHub/Gitea Actions.
+
+## Bot Configuration
+
+The bot is configured via `config.js` to run on the `gitea` platform.

config.js

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 module.exports = {
-    "endpoint": "https://gitea.spenke-nordic.com/api/v1", // replace it with your actual endpoint
-    "gitAuthor": "Renovate Bot <renovate-bot@spenke-nordic.com>",
-    "platform": "gitea",
-    "onboardingConfigFileName": "renovate.json",
-    "autodiscover": true,
-    "optimizeForDisabled": true,
+  endpoint: "https://gitea.spenke-nordic.com/api/v1", // replace it with your actual endpoint
+  gitAuthor: "Renovate Bot <renovate-bot@spenke-nordic.com>",
+  platform: "gitea",
+  onboardingConfigFileName: "renovate.json",
+  autodiscover: true,
+  optimizeForDisabled: true,
+  dependencyDashboard: true,
+  dependencyDashboardTitle: "Dependency Dashboard",
+  prConcurrentLimit: 10,
+  prHourlyLimit: 0,
+  stabilityDays: 3,
+  labels: ["dependencies", "renovate"],
 };

default.json

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "description": "Base configuration with standard rules",
+  "extends": [
+    "config:recommended",
+    ":dependencyDashboard",
+    ":separateMajorReleases",
+    ":combinePatchMinorReleases",
+    "group:allNonMajor"
+  ],
+  "packageRules": [
+    {
+      "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
+      "automerge": true,
+      "automergeType": "pr",
+      "platformAutomerge": true
+    }
+  ]
+}

docker.json

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "description": "Docker specific rules",
+  "extends": [
+    "docker:pinDigests"
+  ],
+  "packageRules": [
+    {
+      "matchDatasources": ["docker"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "automerge": true
+    }
+  ]
+}

renovate.json

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 {
-  "$schema": "https://docs.renovatebot.com/renovate-schema.json"
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "local>paulspenke/renovate-config:default"
+  ]
 }