Change timescaleDB bind mount to docker volume for easier deployment.

docker/compose.with-database-grafana.yml

@@ -14,7 +14,7 @@ services:
     volumes:
       - /etc/timezone:/etc/timezone:ro
       - /etc/localtime:/etc/localtime:ro
-      - /opt/opendtu-logger/database:/var/lib/postgresql/data
+      - opendtu_db:/var/lib/postgresql/data
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U ${PG_USER}"]
       interval: 5s
@@ -62,3 +62,4 @@ networks:
     attachable: true
 volumes:
   opendtu_logger_grafana:
+  opendtu_db: