- Updated `backup.sh` to allow backing up multiple databases by introducing the `DATABASE_NAMES` environment variable.
- Modified `env.sh` to handle the new `DATABASE_NAMES` variable and ensure compatibility with existing `DATABASE_NAME`.
- Updated `docker-compose.yaml` and `README.md` to reflect changes and provide examples for backing up single and multiple databases.
- Added a new binary file `umb_pm_dev.bacpac` for database backup.
Signed-off-by: Shakar Bakr <5h4k4r.b4kr@gmail.com>
