small changes in volume gestion for db

srcs/docker-compose.yml

@@ -46,6 +46,7 @@ services:
         - DB_NAME=${DB_NAME}
         - DB_USER=${DB_USER}
         - DB_PSWD=${DB_PSWD}
+        - DB_VOLUME_DIR=${DB_VOLUME_DIR}
     healthcheck:
       test: mariadb -h ${DB_HOST} -u ${DB_USER} -p"${DB_PSWD}" -e exit 2> /dev/null
       interval: 1s
@@ -76,6 +77,7 @@ services:
         condition: service_healthy
 
 # specify path to named volumes : https://docs.docker.com/compose/compose-file/compose-file-v3/#volume-configuration-reference
+# local driver options : https://stackoverflow.com/questions/62232676/docker-local-volume-driver-options
 volumes:
   db_volume:
     driver: local

srcs/requirements/mariadb/Dockerfile

@@ -16,9 +16,11 @@ ARG DB_HOST
 ARG DB_NAME
 ARG DB_USER
 ARG DB_PSWD
+ARG DB_VOLUME_DIR
 
 # init mysql database
-RUN mysql_install_db --user=mysql --ldata=/var/lib/mysql && \
+# https://dev.mysql.com/doc/refman/5.7/en/mysql-install-db.html
+RUN mysql_install_db --user=mysql --datadir=${DB_VOLUME_DIR} && \
 	mkdir -p /var/run/mysqld && \
 	chown -R mysql:root /var/run/mysqld