Upgrade postgres docker compose (#749)

* Upgrade PG to latest stable version alpine

docker-compose-dev.yaml

@@ -32,7 +32,7 @@ services:
       db:
         condition: service_healthy
   db:
-    image: postgres:13
+    image: postgres:15.2-alpine
     volumes:
       - ../postgres_data:/var/lib/postgresql/data/
     restart: always
@@ -40,8 +40,9 @@ services:
       POSTGRES_USER: mediacms
       POSTGRES_PASSWORD: mediacms
       POSTGRES_DB: mediacms
+      TZ: Europe/London
     healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U mediacms"]
+      test: ["CMD-SHELL", "pg_isready", "--host=db", "--dbname=$POSTGRES_DB", "--username=$POSTGRES_USER"]
       interval: 10s
       timeout: 5s
       retries: 5