docs: added dns bits

readme.md

@@ -16,6 +16,13 @@ Manage core Operating System components and system defaults.
 | `apt_repository_main` | No | `https://archive.ubuntu.com/ubuntu` | Main APT repository (Ubuntu 24+) |
 | `apt_repository_security` | No | `https://archive.ubuntu.com/ubuntu` | Security APT repository (Ubuntu 24+) |
 
+### DNS Configuration
+
+| Variable       | Required | Default                  | Description                    |
+|----------------|----------|--------------------------|--------------------------------|
+| `dns_servers`  | No       | `["192.168.10.1"]`       | List of DNS nameservers to use |
+| `dns_search`   | No       | `["example.internal"]`   | List of search domains to use  |
+
 ### NTP Configuration
 
 | Variable | Required | Default | Description |
@@ -30,6 +37,7 @@ Available tags for selective execution:
 - `apt` - APT package management
 - `apt-cleanup` - Clean APT cache
 - `apt-update` - Update APT packages
+- `dns` - Manage DNS configuration
 - `cron` - Configure cron
 - `environment-file` - Manage environment files
 - `hostname` - Set hostname