alpine: add support for PostgreSQL 18

[komainu8]

We specify PGDATA explicitly.
Because PGDATA is changed to "/var/lib/postgresql/18/docker" since PostgreSQL 18 image.
See: docker-library/postgres#1259

[komainu8]

ログの場所が変わっているっぽい。ログというかPGDATAの場所。

[komainu8]

https://hub.docker.com/_/postgres の以下の記載からPGDATAがvar/lib/postgresql/18/dockerになったらしい。

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Important Change: the PGDATA environment variable of the image was changed to be version specific in PostgreSQL 18 and above⁠. For 18 it is /var/lib/postgresql/18/docker. Later versions will replace 18 with their respective major version (e.g., /var/lib/postgresql/19/docker for PostgreSQL 19.x). The defined VOLUME was changed in 18 and above to /var/lib/postgresql. Mounts and volumes should be targeted at the updated location. This will allow users upgrading between PostgreSQL major releases to use the faster --link when running pg_upgrade and mounting /var/lib/postgresql.

[kou]

All "Test" jobs are failing. Is it expected?

[otegami]

All "Test" jobs are failing. Is it expected?

@komainu8
I tried to fix this issue at the following PR. If the way to fix this issue is no-acceptable, could you close or modify it directly?
#74

[kou]

Failing "Test" jobs are expected because we haven't pushed tags for 4.0.0 yet.