bootstrap-testdata: backport from ba934b8

Author: tlvu

birdhouse/scripts/bootstrap-testdata

@@ -17,15 +17,15 @@ COMPOSE_DIR="${COMPOSE_DIR:-$(dirname "${THIS_DIR}")}"
 if [ -f "${COMPOSE_DIR}/read-configs.include.sh" ]; then
     . "${COMPOSE_DIR}/read-configs.include.sh"
 
-    # Get THREDDS_SERVICE_DATA_LOCATION_ON_HOST
+    # Get THREDDS_SERVICE_DATA_LOCATION_ON_HOST, BIRDHOUSE_DATA_PERSIST_ROOT
     read_configs
 fi
 
 
 if [ -z "${DATASET_ROOT}" ]; then
     # Default for when unable to source read-configs.include.sh (ie when
     # used standalone outside of the checkout).
-    DATASET_ROOT="${THREDDS_SERVICE_DATA_LOCATION_ON_HOST:=/data/datasets}"
+    DATASET_ROOT="${DATASET_ROOT:-${THREDDS_SERVICE_DATA_LOCATION_ON_HOST:-${BIRDHOUSE_DATA_PERSIST_ROOT:-/data}/datasets}}"
 fi
 
 FROM_SERVER=${FROM_SERVER:-"https://pavics.ouranos.ca/twitcher/ows/proxy/thredds/fileServer/birdhouse"}