backup task mysqldump password from env (removing warning from log)

jobs/backup/backup-cronjob.yaml

@@ -26,34 +26,34 @@ spec:
                 - |
                   #while true; do sleep 30; done
                   mkdir -p /data/mariadb-export
-                  echo "INFO: Exporting database"
+                  echo "TRACE: Exporting database"
-                  mysqldump --column-statistics=0 -u ${DB_USER} -p${DB_PASSWORD} -h ${DB_HOST} ${DB_NAME} > /data/mariadb-export/backup.sql
+                  mysqldump --column-statistics=0 -u ${MYSQL_USER} -h ${MYSQL_PWD} ${MYSQL_DB} > /data/mariadb-export/backup.sql
                   if [ $? -ne 0 ]; then
                     echo "ERROR: Exporting database failed"
                     exit 1
                   fi
-                  echo "INFO: Exporting database finished"
+                  echo "TRACE: Exporting database finished"
             
               env:
-                - name: DB_USER
+                - name: MYSQL_USER
                   valueFrom:
                     secretKeyRef:
                       name: nextcloud-db
                       key: db-username
 
-                - name: DB_PASSWORD
+                - name: MYSQL_PWD
                   valueFrom:
                     secretKeyRef:
                       name: nextcloud-db
                       key: db-password
               
-                - name: DB_NAME
+                - name: MYSQL_DB
                   valueFrom: 
                     secretKeyRef:
                       name: backup-secret
                       key: DB_NAME       
                 
-                - name: DB_HOST
+                - name: MYSQL_PWD
                   valueFrom: 
                     secretKeyRef:
                       name: backup-secret