Update develop.md

[scelikcapa]

To solve the issues after PostgreSQL v18+, the volume path has to be changed.

Description

While starting an image, it fails with the error: Error: in 18+, these Docker images are configured to store database data in a db-1 | format which is compatible with "pg_ctlcluster" (specifically, using db-1 | major-version-specific directory names). This better reflects how db-1 | PostgreSQL itself works, and how upgrades are to be performed. db-1 | db-1 | See also https://github.com/docker-library/postgres/pull/1259 db-1 | db-1 | Counter to that, there appears to be PostgreSQL data in: db-1 | /var/lib/postgresql/data (unused mount/volume) db-1 | db-1 | This is usually the result of upgrading the Docker image without db-1 | upgrading the underlying database using "pg_upgrade" (which requires both db-1 | versions). db-1 | db-1 | The suggested container configuration for 18+ is to place a single mount db-1 | at /var/lib/postgresql which will then place PostgreSQL data in a db-1 | subdirectory, allowing usage of "pg_upgrade --link" without mount point db-1 | boundary issues. db-1 | db-1 | See https://github.com/docker-library/postgres/issues/37 for a (long) db-1 | discussion around this process, and suggestions for how to do so.

Related issues or tickets

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