JAVA_HOME - If the java home variable is set as an environment variable,
use it when starting the selenium server. The java executable is assumed to be
found in JAVA_HOME/bin/java.
NO_PROXY - If the no proxy environment variable exists and matches the
host name, to ignore the resolve proxy.
HTTPS_PROXY - If the https proxy environment variable exists and the url
protocol is https, use this proxy.
HTTP_PROXY - If the http proxy environmet variable exists and the url
protocol is http or https, use this proxy.
GITHUB_TOKEN - A GitHub personal access token with no additional scopes
required. When created, it will just have public-access. This can be set at
https://github.com/settings/tokens.