feat: Add dynamic host IP detection for Docker Compose and Supabase config

- Add docker-compose.sh wrapper script that auto-detects host IP
- Update docker-compose.yml to use environment variable substitution
- Update Supabase config.toml files to use HOST_SITE_URL and SUPABASE_API_URL env vars
- Add scripts/get-host-ip.sh for IP detection
- Add scripts/set-host-env.sh for environment setup
- Add scripts/supabase-with-env.sh wrapper for Supabase CLI
- Add documentation for Docker Compose environment setup
- Update README.md with new usage instructions
- Replace hardcoded URLs with dynamic environment variables

scripts/get-host-ip.sh

@@ -0,0 +1,86 @@
+#!/bin/bash
+# Script to detect the host machine's IP address
+# This is useful for Docker containers that need to connect back to services on the host
+
+# Method 1: Try to get IP from default gateway (works in most Docker setups)
+# The default gateway in a Docker container is typically the host machine
+get_ip_from_gateway() {
+    # Try to get the default gateway IP
+    if command -v ip >/dev/null 2>&1; then
+        ip route show default | awk '/default/ {print $3}' 2>/dev/null | head -1
+    elif command -v route >/dev/null 2>&1; then
+        route -n | awk '/^0.0.0.0/ {print $2}' 2>/dev/null | head -1
+    fi
+}
+
+# Method 2: Try host.docker.internal (works on Docker Desktop and with extra_hosts)
+get_ip_from_host_docker_internal() {
+    if command -v getent >/dev/null 2>&1; then
+        getent hosts host.docker.internal 2>/dev/null | awk '{print $1}' | head -1
+    elif command -v nslookup >/dev/null 2>&1; then
+        nslookup host.docker.internal 2>/dev/null | grep -A1 "Name:" | grep "Address:" | awk '{print $2}' | head -1
+    fi
+}
+
+# Method 3: Get IP from network interface (for host machine)
+get_ip_from_interface() {
+    # Try common network interfaces
+    for interface in eth0 enp0s8 enp0s3 ens33; do
+        if command -v ip >/dev/null 2>&1; then
+            ip addr show "$interface" 2>/dev/null | grep -oP 'inet \K[\d.]+' | head -1
+        elif command -v ifconfig >/dev/null 2>&1; then
+            ifconfig "$interface" 2>/dev/null | grep -oP 'inet \K[\d.]+' | head -1
+        fi
+    done
+}
+
+# Method 4: Get IP from hostname (if hostname resolves to an IP)
+get_ip_from_hostname() {
+    # Try to resolve the hostname
+    if command -v hostname >/dev/null 2>&1; then
+        hostname -I 2>/dev/null | awk '{print $1}'
+    fi
+}
+
+# Main logic: Try methods in order of reliability
+detect_host_ip() {
+    local ip=""
+    
+    # If running inside Docker, try gateway method first
+    if [ -f /.dockerenv ] || [ -n "${DOCKER_CONTAINER:-}" ]; then
+        ip=$(get_ip_from_gateway)
+        if [ -n "$ip" ] && [ "$ip" != "127.0.0.1" ]; then
+            echo "$ip"
+            return 0
+        fi
+        
+        # Try host.docker.internal
+        ip=$(get_ip_from_host_docker_internal)
+        if [ -n "$ip" ] && [ "$ip" != "127.0.0.1" ]; then
+            echo "$ip"
+            return 0
+        fi
+    fi
+    
+    # Try interface method (works on host machine)
+    ip=$(get_ip_from_interface)
+    if [ -n "$ip" ] && [ "$ip" != "127.0.0.1" ]; then
+        echo "$ip"
+        return 0
+    fi
+    
+    # Try hostname method
+    ip=$(get_ip_from_hostname)
+    if [ -n "$ip" ] && [ "$ip" != "127.0.0.1" ]; then
+        echo "$ip"
+        return 0
+    fi
+    
+    # Fallback: return localhost (not ideal but better than nothing)
+    echo "127.0.0.1"
+    return 1
+}
+
+# Execute and output the IP
+detect_host_ip
+