Rename pica-backupv2 to db-backup

db-backup/Dockerfile

db-backup/backup_env_var.py

db-backup/config/backup_data.json

db-backup/mongo-run.sh

db-backup/mysql-run.sh

db-backup/postgres-run.sh

db-backup/run.sh

pica-backup/Dockerfile

pica-backup/docker-compose.yml

pica-backup/mysql-backup

pica-backup/postgres-backup

pica-backupv2/mongo-run.sh

pica-backupv2/mysql-run.sh

pica-backupv2/postgres-run.sh

pica-backupv2/run.sh