Extract shared utility functions into a dedicated library file:
- query_postgres_container: Execute SQL queries in postgres container
- copy_database: Copy database using pgm
- copy_filestore: Copy Odoo filestore directory
- exec_python_script_in_odoo_shell: Run Python scripts in Odoo shell
Benefits:
- Single source of truth for utility functions
- Easier maintenance and testing
- Consistent behavior across all scripts
- Reduced code duplication
Also introduces readonly constants DATASTORE_PATH and FILESTORE_SUBPATH
to avoid hardcoded paths scattered throughout the codebase.
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