Upgrade PostgreSQL from 16.1 to 18.0

It was necessary to change the postgres-data path.
Otherwise we got this error:

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

Author: thomasregnet

.devcontainer/compose.yaml

@@ -33,12 +33,12 @@ services:
     - redis-data:/data
 
   postgres:
-    image: postgres:16.1
+    image: postgres:18.0
     restart: unless-stopped
     networks:
     - default
     volumes:
-    - postgres-data:/var/lib/postgresql/data
+    - postgres-data:/var/lib/postgresql
     environment:
         POSTGRES_USER: postgres
         POSTGRES_PASSWORD: postgres