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Julian Sommer
2ad9d64c48
Adds scripts/images/rds-mariadb/: the manifest with every mariadb package pinned =~11.8, setup.sh, the rds-datadir and rds-agent services, and the static include drop-in that points MariaDB at the generated configuration on the data volume. The AMI carries engine=mariadb, engine-version=11.8 and the data-volume contract tag, so resolveEngineAMI can select it. The include is named zz- rather than 00-: MariaDB walks an include directory in byte order and takes the last occurrence of a setting, so a digit prefix would sort ahead of Alpine's packaged mariadb-server.cnf and let a distribution default beat a platform-owned one. setup.sh asserts the resulting order against the real directory at build time. The include target is baked empty as well, because MariaDB treats an includedir it cannot open as a fatal defaults-parsing error and a boot with no data volume would otherwise lose the client alongside the server. The packaged drop-in also sets skip-networking, which would leave the endpoint resolving and the health probe passing while nothing on the customer ENI could connect. setup.sh disables it at the source and asserts no configuration file still does. The mariadb service is deliberately not enabled: the packaged service only warns about an empty datadir rather than refusing, so an engine enabled before the bootstrap exists would launch mysqld_safe against an unbootstrapped volume. rds-datadir moves to scripts/images/common/ rather than being copied. Volume selection, format authorization and mount are already engine-neutral; the mount point and owning user are the only per-engine facts and now come from each preset's own service. The script fails closed when either is unset, so no image can inherit another engine's layout by omission.