[Misc] Update volume path for Postgres 18+ compatibility

Postgres 18+ expects the volume mount at /var/lib/postgresql/ so it can
manage the data directory structure itself with major-version-specific
directory names.

See: docker-library/postgres#1259

Co-authored-by: Mats Gertsen <mats.gertsen@flavia-it.de>

Author: MatsG23

16/postgres-tomcat/docker-compose.yml

@@ -49,7 +49,7 @@ services:
     image: "postgres:18"
     container_name: xwiki-postgres-db
     volumes:
-      - postgres-data:/var/lib/postgresql/data
+      - postgres-data:/var/lib/postgresql
     environment:
       - POSTGRES_ROOT_PASSWORD=${POSTGRES_ROOT_PASSWORD}
       - POSTGRES_PASSWORD=${DB_PASSWORD}

17.4/postgres-tomcat/docker-compose.yml

@@ -49,7 +49,7 @@ services:
     image: "postgres:18"
     container_name: xwiki-postgres-db
     volumes:
-      - postgres-data:/var/lib/postgresql/data
+      - postgres-data:/var/lib/postgresql
     environment:
       - POSTGRES_ROOT_PASSWORD=${POSTGRES_ROOT_PASSWORD}
       - POSTGRES_PASSWORD=${DB_PASSWORD}

17/postgres-tomcat/docker-compose.yml

@@ -49,7 +49,7 @@ services:
     image: "postgres:18"
     container_name: xwiki-postgres-db
     volumes:
-      - postgres-data:/var/lib/postgresql/data
+      - postgres-data:/var/lib/postgresql
     environment:
       - POSTGRES_ROOT_PASSWORD=${POSTGRES_ROOT_PASSWORD}
       - POSTGRES_PASSWORD=${DB_PASSWORD}