feat: add Technitium DNS Home Assistant add-on

- repository.yaml manifest for HA add-on store
- technitium_dns add-on using upstream technitium/dns-server image
- config.yaml with ports 53/udp, 53/tcp, 5380/tcp and password schema
- Dockerfile symlinks /etc/dns to /data/dns for persistent config
- READMEs for repo and add-on

.gitignore

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+# build artifacts
+*.log
+*.tmp
+.DS_Store

README.md

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+# Hassio_Addons
+
+Home Assistant add-on repository hosting the Technitium DNS add-on.
+
+## Add-ons
+
+| Add-on | Description |
+|---|---|
+| [technitium_dns](./technitium_dns/) | Technitium DNS Server — local DNS with ad-blocking, web console, acts as secondary to a primary Technitium instance in Kubernetes via DNS Replication |
+
+## Add this repository to Home Assistant
+
+**Settings → Add-ons → Add-on Store → ⋮ (top right) → Repositories**
+
+```
+https://git.kenschiano.net/kschiano/Hassio_Addons.git
+```
+
+Then refresh the add-on store and install **Technitium DNS**.
+
+## Repo layout
+
+```
+Hassio_Addons/
+├── repository.yaml              # repository manifest (read by HA)
+└── technitium_dns/
+    ├── config.yaml               # add-on metadata, ports, schema
+    ├── Dockerfile               # thin layer on technitium/dns-server:latest
+    └── README.md
+```
+
+## Update workflow
+
+1. Bump `version` in `technitium_dns/config.yaml`.
+2. Commit and push to `git.kenschiano.net/kschiano/Hassio_Addons.git`.
+3. In Home Assistant: refresh the add-on store, update the add-on, rebuild.
+
+## Notes
+
+- The add-on uses the upstream `technitium/dns-server` image directly — no custom build pipeline needed.
+- Config persists to the add-on config volume (`/data/dns` symlinked to `/etc/dns`).
+- For primary/secondary replication setup, see `technitium_dns/README.md`.

repository.yaml

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+name: Technitium
+url: https://git.kenschiano.net/kschiano/Hassio_Addons
+maintainer: kschiano

technitium_dns/Dockerfile

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+ARG BUILD_FROM=ghcr.io/hassio-addons/base:latest
+FROM technitium/dns-server:latest
+
+# Home Assistant add-on requirements
+ENV DATA_DIR="/data/dns"
+
+# Technitium stores its config in /etc/dns by default; use the add-on data
+# directory so settings persist across restarts.
+RUN mkdir -p /data/dns && \
+    ln -s /data/dns /etc/dns
+
+# Home Assistant expects a run command via S6/entrypoint; Technitium ships its own.
+ENTRYPOINT []
+CMD ["dotnet", "DnsServerApp.dll"]

technitium_dns/README.md

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+# Technitium DNS - Home Assistant Add-on
+
+Runs the [Technitium DNS Server](https://technitium.com/dns/) inside Home Assistant as a supervised add-on.
+
+## Features
+- Ad-blocking DNS server with web console on port 5380
+- Local DNS records, conditional forwarding, DNS-over-TLS/HTTPS
+- Persists config to the add-on config volume
+- Designed to act as **secondary** to a primary Technitium instance via DNS Replication
+
+## Installation
+
+1. Add this repository in Home Assistant:
+   **Settings → Add-ons → Add-on Store → ⋮ → Repositories**
+   ```
+   https://git.kenschiano.net/kschiano/Hassio_Addons.git
+   ```
+2. Refresh the add-on store, then install **Technitium DNS**.
+3. Set `admin_password` and `timezone` in the add-on config.
+4. Start the add-on and open the web UI at `http://homeassistant.local:5380`.
+
+## Failover / Replication setup
+
+This add-on is intended to run as a **secondary** to a primary Technitium instance deployed to Kubernetes. See the repository root README for the full primary/secondary replication plan.
+
+Quick steps:
+1. On the **Primary** (k8s): Settings → Replication → generate API key, add this host as secondary (`https://homeassistant.local:5380`).
+2. On this add-on: Settings → Replication → set the same API key, enable secondary mode.
+
+## Updating the add-on
+
+The add-on pulls `technitium/dns-server:latest` upstream. To update:
+1. Rebuild the add-on image: **Settings → Add-ons → Technitium DNS → Rebuild**
+2. Or restart the add-on after bumping `version` in `config.yaml`.
+
+## Repository
+
+Source: https://git.kenschiano.net/kschiano/Hassio_Addons

technitium_dns/config.yaml

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+name: Technitium DNS
+version: 1.0.0
+slug: technitium_dns
+description: Technitium DNS Server add-on for Home Assistant
+arch:
+  - amd64
+  - aarch64
+  - armv7
+init: false
+url: https://github.com/technitiumsoftware/dnsserver
+webui: http://[HOST]:[PORT:5380]/
+ports:
+  53/udp: 53
+  53/tcp: 53
+  5380/tcp: 5380
+map:
+  - addon_config:rw
+  - ssl
+options:
+  admin_password: CHANGE_ME
+  timezone: UTC
+schema:
+  admin_password: password
+  timezone: str
+image: technitium/dns-server