Dyanmic server to support byte ranges for variation workflows

To test

(copy .env.example to .env and update token information in .env)
cp .env.example .env

The test uses public workspaces in appdev or ci So set the following variables for ci or appdev in .env file
KBASE_ENDPOINT=https://appdev.kbase.us/services
token=************

docker-compose up
In a separate terminal run
docker-compose run web test