mariadb-migrator-configure

Write the MySQL-to-MariaDB migrator's config/migration.yaml with migrator.set_config — the rules that get a configuration refused (every named account must be a configured MCP connection, SRC_PORT/TGT_PORT always explicit, no password key ever, string values only), the keys each mode requires, the useful optional keys, and what MIGRATE_APP_USERS does to accounts and grants. Use when configuring a migration, when set_config was refused, when a password or app-user migration needs setting up, or when correcting a configuration with merge=True. Read mariadb-migrator first for the tools and preconditions.