feat: enhance Docker setup with environment variable management and add example docker-compose file

entrypoint.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+set -e
+
+echo "🔧 Replacing environment variable placeholders..."
+
+# Replace env variable placeholders with real values for NEXT_PUBLIC_ variables
+printenv | grep NEXT_PUBLIC_ | while read -r line ; do
+  key=$(echo "$line" | cut -d "=" -f1)
+  value=$(echo "$line" | cut -d "=" -f2-)
+  
+  echo "  🔄 Replacing $key with actual value"
+  
+  # Replace in all .next files
+  find /app/.next/ -type f \( -name "*.js" -o -name "*.json" \) -exec sed -i "s|$key|$value|g" {} \; 2>/dev/null || true
+done
+
+echo "✅ Environment variable replacement complete"
+
+# Execute the container's main process (CMD in Dockerfile)
+exec "$@"