Added Homebridge support (#72)

homebridge/README.md

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+# Run Homebridge on your UDM
+
+### Features
+1. Run [Homebridge](https://homebridge.io/) on your UDM.
+2. Integrate Unifi Protect cameras in HomeKit via `homebridge-unifi-protect`.
+3. Persists through reboots and firmware updates.
+
+### Requirements
+1. You have successfully setup the on boot script described [here](https://github.com/boostchicken/udm-utilities/tree/master/on-boot-script).
+
+### Customization
+
+- Update [90-homebridge.conflist](cni/90-homebridge.conflist) to match your network:
+  - Change `"bridge": "br0"` to the appropriate VLAN for your network.
+  - Update `"subnet"` and `"gateway"` to match that VLAN.
+  - If you want a specific IP assigned, update `"rangeStart"` and `"rangeEnd"`. Otherwise those properties can be deleted.
+
+### Steps
+
+1. `mkdir -p /mnt/data/homebridge/run`
+2. Copy [25-homebridge.sh](on_boot.d/25-homebridge.sh) to `/mnt/data/on_boot.d`.
+3. Copy [90-homebridge.conflist](cni/90-homebridge.conflist) to `/mnt/data/podman/cni`. This will create the podman network that bridges the container to your VLAN.
+4. Run the Homebridge docker container. Change the timezone (`-e TZ`) to match your timezone, and DNS (`--dns`) to match your VLAN gateway.
+
+    ```shell script
+     podman run -d --restart always \
+        --privileged \
+        --name homebridge \
+        --net homebridge \
+        --dns 192.168.1.1 \
+        --dns-search lan \
+        -e TZ=America/Chicago \
+        -e PGID=0 -e PUID=0 \
+        -e HOMEBRIDGE_CONFIG_UI=1 \
+        -e HOMEBRIDGE_CONFIG_UI_PORT=80 \
+        -v "/mnt/data/homebridge/:/homebridge/" \
+        -v "/mnt/data/homebridge/run/:/run/" \
+        oznu/homebridge:latest
+    ```
+
+5. Access the Homebridge UI based on the IP you assigned, like [http://192.168.1.20/](http://192.168.1.20/).
+6. If using the UDM Pro, the `homebridge-unifi-protect` plugin can be installed via the Homebridge UI to integrate Unifi Protect cameras.

homebridge/cni/90-homebridge.conflist

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+{
+  "cniVersion": "0.4.0",
+  "name": "homebridge",
+  "plugins": [
+      {
+         "type": "bridge",
+         "bridge": "br0",
+         "ipam": {
+            "type": "host-local",
+            "ranges": [
+                [
+                    {
+                        "subnet": "192.168.1.0/24",
+                        "rangeStart": "192.168.1.20",
+                        "rangeEnd": "192.168.1.20",
+                        "gateway": "192.168.1.1" 
+                    }
+                ]
+            ],
+            "routes": [
+                {"dst": "0.0.0.0/0"}
+            ]
+         }
+      },
+      {
+         "type": "tuning",
+         "capabilities": {
+            "mac": true
+         }
+      }
+  ]
+}

homebridge/on_boot.d/25-homebridge.sh

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+#!/bin/sh
+CONTAINER=homebridge
+
+# Starts the homebridge container on boot.
+# All configs stored in /mnt/data/homebridge
+
+if podman container exists ${CONTAINER}; then
+  podman start ${CONTAINER}
+else
+  logger -s -t homebridge -p ERROR Container $CONTAINER not found, make sure you set the proper name, you can ignore this error if it is your first time setting it up
+fi
+