PILE_CONFIG_PATH - full path to pile-config.js, defaults to
[ROOT]/../../config/pile-config
WU_CONFIG_PATH   - full path to wu-config.js, defaults to
/systemapic/config/wu-config.js
only needed for tests
Accessed database hostname is hardcoded to be postgis.
SYSTEMAPIC_PGSQL_USERNAME - username to access db
SYSTEMAPIC_PGSQL_PASSWORD - password to access db
Tests are meant to be run from within the docker appropriately started with all links expected from the systemapic-docker configuration.
Inside such docker, tests are run using:
 npm test