fix: use public docker.io image in docker-compose for local dev

docker-compose.yml is for local development, so it should use
docker.io/constructiveio/postgres-plus:18 (publicly accessible)
instead of ghcr.io (requires GitHub keys).

Author: pyramation

docker-compose.yml

@@ -1,7 +1,7 @@
 services:
   postgres:
     container_name: postgres
-    image: ghcr.io/constructive-io/docker/postgres-plus:18
+    image: docker.io/constructiveio/postgres-plus:18
     environment:
       - POSTGRES_USER=postgres
       - POSTGRES_PASSWORD=password