Add podman and homeassistant/esphome container support

Added podman to REQUIRED_PACKAGES for running homeassistant and esphome
containers on R5C.

Created docker/start-containers.sh script to start both containers with
persistent /srv volumes for configuration.

Ready for migration of homeassistant + esphome from 10.42.0 to 10.42.1.
Configs can be copied from old vanrouter at /srv/homeassistant and
/srv/esphome, then containers started on R5C.

Ports:
- Home Assistant: 8123 (accessed via --network=host)
- ESPHome: 6052
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

docker/start-containers.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+# Start homeassistant and esphome containers on R5C
+# Usage: sudo ./start-containers.sh
+
+set -e
+
+echo "=== Starting Home Assistant and ESPHome containers ==="
+
+# Ensure /srv exists
+sudo mkdir -p /srv/homeassistant /srv/esphome
+
+# Start homeassistant
+echo "Starting Home Assistant..."
+podman run -d \
+  --name homeassistant \
+  --restart=always \
+  --privileged \
+  -v /srv/homeassistant:/config \
+  -v /run/dbus:/run/dbus:ro \
+  --network=host \
+  ghcr.io/home-assistant/home-assistant:stable
+
+# Start esphome
+echo "Starting ESPHome..."
+podman run -d \
+  --name esphome \
+  --restart=always \
+  -v /srv/esphome:/config \
+  -p 6052:6052 \
+  ghcr.io/esphome/esphome:stable \
+  dashboard /config
+
+echo "✅ Containers started"
+echo "  Home Assistant: http://10.42.1.1:8123"
+echo "  ESPHome: http://10.42.1.1:6052"