dockerfile fixes

Dockerfile

@@ -17,10 +17,14 @@ RUN mkdir -p /app/data
 # Accept build arguments
 ARG SITE_URL=https://nlcc.rydertech.us
 ARG AUTH_SECRET=change-this-secret-in-production
+ARG ADMIN_USERNAME=admin
+ARG ADMIN_PASSWORD=admin123
 
 # Set environment variables for build
 ENV SITE_URL=$SITE_URL
 ENV AUTH_SECRET=$AUTH_SECRET
+ENV ADMIN_USERNAME=$ADMIN_USERNAME
+ENV ADMIN_PASSWORD=$ADMIN_PASSWORD
 
 # Build the application
 RUN npm run build