compose: Use pre-built Docker images for CMG services

Update the Docker compose file to use pre-built Docker images for the
CMG services (i.e. Gateway, Scheduler, Ripper) instead of building them
locally on deployment. The images (currently built from 'main' with the
'main' and 'latest' tags) are available on Docker Hub:
* https://hub.docker.com/r/cogstacksystems/cogstack-model-gateway
* https://hub.docker.com/r/cogstacksystems/cogstack-model-gateway-scheduler
* https://hub.docker.com/r/cogstacksystems/cogstack-model-gateway-ripper

Signed-off-by: Phoevos Kalemkeris <[email protected]>

Author: phoevos

docker-compose.yaml

@@ -1,3 +1,5 @@
+name: cmg
+
 services:
   postgres:
     image: postgres:17.2
@@ -89,13 +91,7 @@ services:
       retries: 3
 
   gateway:
-    build:
-      context: .
-      dockerfile: ./cogstack_model_gateway/gateway/Dockerfile
-      args:
-      - HTTP_PROXY=$HTTP_PROXY
-      - HTTPS_PROXY=$HTTPS_PROXY
-      - NO_PROXY=$NO_PROXY
+    image: cogstacksystems/cogstack-model-gateway:latest
     restart: always
     environment:
     - CMG_DB_USER=$CMG_DB_USER
@@ -137,13 +133,7 @@ services:
     - cogstack-model-serve_cms
 
   scheduler:
-    build:
-      context: .
-      dockerfile: ./cogstack_model_gateway/scheduler/Dockerfile
-      args:
-      - HTTP_PROXY=$HTTP_PROXY
-      - HTTPS_PROXY=$HTTPS_PROXY
-      - NO_PROXY=$NO_PROXY
+    image: cogstacksystems/cogstack-model-gateway-scheduler:latest
     restart: always
     environment:
     - CMG_DB_USER=$CMG_DB_USER
@@ -182,13 +172,7 @@ services:
     - cogstack-model-serve_cms
 
   ripper:
-    build:
-      context: .
-      dockerfile: ./cogstack_model_gateway/ripper/Dockerfile
-      args:
-      - HTTP_PROXY=$HTTP_PROXY
-      - HTTPS_PROXY=$HTTPS_PROXY
-      - NO_PROXY=$NO_PROXY
+    image: cogstacksystems/cogstack-model-gateway-ripper:latest
     restart: always
     environment:
     - CMG_RIPPER_INTERVAL=$CMG_RIPPER_INTERVAL