environment variables

`"DEVHUB_LOG_TYPE"`

Valid values: elasticsearch, simple-file, console, off
Set Example: export DEVHUB_LOG_TYPE="off"
Default value: elasticsearch

`"DEVHUB_IP"`

Valid values: "127.0.0.1", "0.0.0.0", ...
Set Example: export DEVHUB_IP="0.0.0.0"
Default value: "127.0.0.1"

`"DEVHUB_PORT"`

Valid values: 9009, 55555, ...
Set Example: export DEVHUB_PORT=55555
Default value: 9009

`"DEVHUB_FACILITY"`

Valid values: any string
Set Example: export DEVHUB_FACILITY="SE3"
Default value: none