🐛 fix: properly detect Docker container vs native execution

- Enhance getPostgresHost() to detect Docker environment
- Check multiple Docker-specific indicators
- Use container name when running inside Docker
- Use localhost when running natively
- Fix BDD test PostgreSQL connection issues

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

pkg/bdd/testserver/server.go

@@ -17,15 +17,27 @@ import (
 )
 
 // getPostgresHost returns the appropriate PostgreSQL host based on environment
-// Uses DLC_DATABASE_HOST environment variable or defaults appropriately
+// Uses DLC_DATABASE_HOST environment variable or detects execution context
 func getPostgresHost() string {
 	host := os.Getenv("DLC_DATABASE_HOST")
 	if host != "" {
 		return host
 	}
-	// Default to localhost for native execution, container name for Docker
-	// When running natively but PostgreSQL is in Docker, use localhost (port mapping)
-	// When running in Docker containers, use container name
+
+	// Detect if we're running inside a Docker container
+	// Check for Docker-specific environment variables or files
+	if os.Getenv("DOCKER_CONTAINER") != "" ||
+		os.Getenv("KUBERNETES_SERVICE_HOST") != "" ||
+		os.Getenv("container") == "docker" {
+		return "dance-lessons-coach-postgres" // Use container name in Docker
+	}
+
+	// Check for .dockerenv file (Docker-specific)
+	if _, err := os.Stat("/.dockerenv"); err == nil {
+		return "dance-lessons-coach-postgres" // Use container name in Docker
+	}
+
+	// Default to localhost for native execution (PostgreSQL port mapping)
 	return "localhost"
 }