Fix env-var bug on vendor-service

Author: mrnicegyu11

services/vendors/template.env

@@ -10,3 +10,4 @@ VENDOR_CHATBOT_PRODUCTS=${VENDOR_CHATBOT_PRODUCTS}
 VENDOR_CHATBOT_PORT=${VENDOR_CHATBOT_PORT}
 PUBLIC_NETWORK=${PUBLIC_NETWORK}
 OTEL_EXPORTER_OTLP_ENDPOINT=${TRACING_OPENTELEMETRY_COLLECTOR_ENDPOINT}:${TRACING_OPENTELEMETRY_COLLECTOR_PORT}
+OPENAI_API_KEY=${OPENAI_API_KEY}