Update examples section according to the latest docker compose requirements.

Signed-off-by: Kaloyan Nikolov <tzerber@gmail.com>

.examples/docker-compose/insecure/postgres/apache/compose.yaml

@@ -1,9 +1,11 @@
-version: '3'
-
 services:
   db:
     image: postgres:alpine
     restart: always
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "50m"
     volumes:
       - db:/var/lib/postgresql/data:Z
     env_file:
@@ -16,12 +18,16 @@ services:
   app:
     image: nextcloud:apache
     restart: always
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "50m"
     ports:
       - 127.0.0.1:8080:80
     volumes:
       - nextcloud:/var/www/html:z
     environment:
-      - POSTGRES_HOST=db
+      - MYSQL_HOST=db
       - REDIS_HOST=redis
     env_file:
       - db.env
@@ -32,6 +38,10 @@ services:
   cron:
     image: nextcloud:apache
     restart: always
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "50m"
     volumes:
       - nextcloud:/var/www/html:z
     entrypoint: /cron.sh
@@ -41,4 +51,4 @@ services:
 
 volumes:
   db:
-  nextcloud:
+  nextcloud: