The API_URLS environment variable can be used to run the Docker image with multiple urls.
Example:
docker run -p 80:8080 -e API_URLS=[{name:"First API", url:"http://firstapiurl"},{name:"Second API", url:"http://secondapiurl"}] swaggerapi/swagger-ui
If swagger-ui is run behind reverse proxy in path other than / accessing
bundled swagger json configured in SWAGGER_JSON env variable will fail.
Fix that by changing REL_PATH prefix from `/` to `./`