feat: Add Duck DNS

apps/duckdns/config.json

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+{
+    "name": "Duck DNS",
+    "available": true,
+    "port": 8026,
+    "exposable": false,
+    "id": "duckdns",
+    "description": "Duck DNS is a free service which will point a DNS (sub domains of duckdns.org) to an IP of your choice",
+    "tipi_version": 1,
+    "version": "b14c520a-ls8",
+    "categories": ["network"],
+    "short_desc": "Duck DNS is a free Dynamic DNS service",
+    "author": "linuxserver.io",
+    "source": "https://github.com/linuxserver/docker-duckdns",
+    "website": "https://docs.linuxserver.io/images/docker-duckdns/",
+    "supported_architectures": ["arm64", "amd64"],
+    "uid": 1000,
+    "gid": 1000,
+    "form_fields": [
+        {
+            "type": "text",
+            "label": "Subdomains (comma separated). E.g. `mydomain1,mydomain2`.",
+            "max": 1024,
+            "min": 3,
+            "required": true,
+            "env_variable": "DUCKDNS_SUBDOMAINS"
+        },
+        {
+            "type": "password",
+            "label": "DuckDNS Token",
+            "max": 128,
+            "min": 3,
+            "required": true,
+            "env_variable": "DUCKDNS_TOKEN"
+        },
+        {
+            "type": "text",
+            "label": "Update IP (blank, ipv4, ipv6 or both). Setting this value uses external Cloudflare whoami service. Omitting the field uses DuckDNS for detection and only supports IPv4.",
+            "required": false,
+            "env_variable": "DUCKDNS_UPDATE_IP"
+        },
+        {
+            "type": "boolean",
+            "label": "Enable logging",
+            "required": false,
+            "env_variable": "DUCKDNS_ENABLE_LOG_FILE"
+        }
+    ]
+  }

apps/duckdns/docker-compose.arm64.yml

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+version: "3.9"
+services:
+  duckdns:
+    container_name: duckdns # Should be exact same name as "id" field in config.json
+    image: lscr.io/linuxserver/duckdns:arm64v8-b14c520a-ls8 # Try to avoid "latest" tag. As it may break configs in the future.
+    environment:
+      - PUID=1000
+      - PGID=1000
+      - TZ=${TZ}
+      - SUBDOMAINS=${DUCKDNS_SUBDOMAINS}
+      - TOKEN=${DUCKDNS_TOKEN}
+      - UPDATE_IP=${DUCKDNS_UPDATE_IP}
+      - LOG_FILE=${DUCKDNS_ENABLE_LOG_FILE}
+    volumes:
+      - ${APP_DATA_DIR}:/config
+    ports:
+      - ${APP_PORT}:80
+    restart: unless-stopped
+    networks:
+      - tipi_main_network

apps/duckdns/docker-compose.yml

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+version: "3.9"
+services:
+  duckdns:
+    container_name: duckdns # Should be exact same name as "id" field in config.json
+    image: lscr.io/linuxserver/duckdns:b14c520a-ls8 # Try to avoid "latest" tag. As it may break configs in the future.
+    environment:
+      - PUID=1000
+      - PGID=1000
+      - TZ=${TZ}
+      - SUBDOMAINS=${DUCKDNS_SUBDOMAINS}
+      - TOKEN=${DUCKDNS_TOKEN}
+      - UPDATE_IP=${DUCKDNS_UPDATE_IP}
+      - LOG_FILE=${DUCKDNS_ENABLE_LOG_FILE}
+    volumes:
+      - ${APP_DATA_DIR}:/config
+    ports:
+      - ${APP_PORT}:80
+    restart: unless-stopped
+    networks:
+      - tipi_main_network

apps/duckdns/metadata/description.md

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+# DuckDNS
+
+[Duckdns](https://duckdns.org/) is a free service which will point a DNS (sub domains of duckdns.org) to an IP of your choice. The service is completely free, and doesn't require reactivation or forum posts to maintain its existence.
+
+[![duckdns](https://raw.githubusercontent.com/linuxserver/docker-templates/master/linuxserver.io/img/duckdns.png)](https://duckdns.org/)
+
+## Supported Architectures
+
+We utilise the docker manifest for multi-platform awareness. More information is available from docker [here](https://distribution.github.io/distribution/spec/manifest-v2-2/#manifest-list) and our announcement [here](https://blog.linuxserver.io/2019/02/21/the-lsio-pipeline-project/).
+
+Simply pulling `lscr.io/linuxserver/duckdns:latest` should retrieve the correct image for your arch, but you can also pull specific arch images via tags.
+
+The architectures supported by this image are:
+
+| Architecture | Available | Tag |
+| :----: | :----: | ---- |
+| x86-64 | ✅ | amd64-\<version tag\> |
+| arm64 | ✅ | arm64v8-\<version tag\> |
+| armhf | ❌ | |
+
+## Application Setup
+
+- Go to the [duckdns website](https://duckdns.org/), register your subdomain(s) and retrieve your token
+- Create a container with your subdomain(s) and token. If you own user.duckdns.org, you put `SUBDOMAINS=user` you would NOT put a sub subdomain like overseerr from overseerr.user.ducksdns.org
+- It will update your IP with the DuckDNS service every 5 minutes (with a random jitter)
+
+## Notice regarding automatic detection
+
+Using the `UPDATE_IP` variable whatever its value (`ipv4`, `ipv6` or `both`) uses external *Cloudflare whoami* service to detect public IP addresses.
+**Be aware that using this variable will query a third-party service other than DuckDNS.**
+
+Omitting the `UPDATE_IP` variable uses DuckDNS for detection and only supports IPv4.