APP_ENV: specifies which environment the app runs in. If not specified, local is assumed.
TEST_LOG: if specified, logs emitted during tests will be printed to stdout. If not specified, logs are dropped.
POSTGRES_USER, POSTGRES_PASSWORD, POSTGRES_DB, POSTGRES_PORT: variables configuring the DB container. Default values can be found in ./scripts/init-db.sh.
SKIP_DOCKER: If is specified, running ./scripts/init-db.sh doesn't setup the DB docker container.