Fix Docker for PostgreSQL (#8224)

Better fix instead of https://github.com/FreshRSS/FreshRSS/pull/8216
Based on error message:

Error: in 18+, these Docker images are configured to store database data in a
format which is compatible with "pg_ctlcluster" (specifically, using
major-version-specific directory names).  This better reflects how
PostgreSQL itself works, and how upgrades are to be performed.

See also https://github.com/docker-library/postgres/pull/1259

Counter to that, there appears to be PostgreSQL data in:
 /var/lib/postgresql/data (unused mount/volume)

This is usually the result of upgrading the Docker image without
upgrading the underlying database using "pg_upgrade" (which requires both
versions).

The suggested container configuration for 18+ is to place a single mount
at /var/lib/postgresql which will then place PostgreSQL data in a
subdirectory, allowing usage of "pg_upgrade --link" without mount point
boundary issues.

See https://github.com/docker-library/postgres/issues/37 for a (long)
discussion around this process, and suggestions for how to do so.

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