feat: Schedule Renovate to run only between 2-4 AM

Add schedule configuration to reduce resource usage by limiting
Renovate runs to a nightly maintenance window.

- schedule: 'after 2am and before 4am'
- timezone: Europe/Amsterdam

Renovate will now only check for updates during this window instead
of running continuously.

files/config.js.tpl

@@ -25,6 +25,11 @@ module.exports = {
   // Additional recommended settings for Gitea
   requireConfig: 'optional',
 
+  // Schedule configuration - only run during specified time window
+  // This reduces resource usage by limiting when Renovate checks for updates
+  schedule: ['after 2am and before 4am'],
+  timezone: 'Europe/Amsterdam',
+
   // Regex managers for custom version detection
   // This enables Renovate to detect Docker image versions in Terraform files
   // when annotated with: # renovate: datasource=docker

variables.tf

@@ -10,6 +10,7 @@ variable "container_name" {
 variable "renovate_image" {
   description = "Docker image for Renovate"
   type        = string
+  # renovate: datasource=docker
   default     = "renovate/renovate:latest"
 }