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 docker-library/postgres#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 docker-library/postgres#37 for a (long)
db-1 | discussion around this process, and suggestions for how to do so.

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