Fix cron auto-import env vars and health check log spam for Firefly III Data Importer

- Source /etc/environment in cronupdate to load addon env vars (FIREFLY_III_URL, etc.)
- Persist cron-needed vars (JSON_CONFIGURATION_DIR, IMPORT_DIR_WHITELIST, etc.) to /etc/environment
- Fix inverted nginx map values that caused health check logs to spam while suppressing real requests

Co-authored-by: alexbelgium <44178713+alexbelgium@users.noreply.github.com>

fireflyiii_data_importer/rootfs/templates/cronupdate

@@ -2,6 +2,10 @@
 # shellcheck shell=bash
 set -e
 
+# Source environment variables for cron context
+# shellcheck disable=SC1091
+if [ -f /etc/environment ]; then set -a; . /etc/environment; set +a; fi
+
 CONFIGSOURCE="$(bashio::config "CONFIG_LOCATION")"
 
 (