Swagger UI: 127.0.0.1:8080/docs
REST endpoint: localhost:8080/rest/demo

Swagger UI can be also run separately if needed:
docker run --name swagger-ui-test -p 8000:8080 swaggerapi/swagger-ui:v2.2.9
OR
docker run --name swagger-ui-test -p 8000:8080 swaggerapi/swagger-ui:v3.0.9

Tags listed at: https://registry.hub.docker.com/v1/repositories/swaggerapi/swagger-ui/tags/
https://registry.hub.docker.com/v2/repositories/swaggerapi/swagger-ui/tags/