List Available Environment Variables

[RickyGrassmuck]

Would be nice to see a full list of environment variables that will be used to generate the config.js file. Currently you have to navigate to the github repo, find the app.sh file and look through it to see what it's using. Adding the items below to the Docker Hub README page would be very convenient.

root@3db5a4c2e098:/#  grep -oP "\w*[A-Z][A-Z]+\w*?" app/app.sh | grep -v 'EOF'
HOST
PORT
KEY_LENGTH
MAX_LENGTH
STATIC_MAX_AGE
RECOMPRESS_STATIC_ASSETS
LOGGING_LEVEL
LOGGING_TYPE
LOGGING_COLORIZE
KEY_GENERATOR_TYPE
STORAGE_TYPE
STORAGE_PATH
STORAGE_HOST
STORAGE_PORT
STORAGE_DB
STORAGE_EXPIRE