Switch the compose file to use images built by CI

I've left the test image to build the local application so that it can
specify the "dev" multistage build target. Otherwise, it won't be able
to run tests.

compose.yaml

@@ -5,20 +5,17 @@ secrets:
 
 services:
   shell:
-    build:
-      context: .
-      dockerfile: docker/ingest/Dockerfile
-      target: prod
+    image: ghcr.io/noaa-gsl/vxingest/ingest:main
     volumes:
       - ${data}:/opt/data
       - ${public}:/public
     secrets:
       - CREDENTIALS_FILE
     environment:
     - CREDENTIALS=/run/secrets/CREDENTIALS_FILE
-    command: /bin/bash
+    entrypoint: /bin/bash
   test:
-    build:
+    build: # build the image so we can specify the target
       context: .
       dockerfile: docker/ingest/Dockerfile
       target: dev
@@ -31,10 +28,7 @@ services:
     command: poetry run pytest tests
   # FIXME - add a way to specify unit & integration tests
   ingest:
-    build:
-      context: .
-      dockerfile: docker/ingest/Dockerfile
-      target: prod
+    image: ghcr.io/noaa-gsl/vxingest/ingest:main
     volumes:
       - ${data}:/opt/data
       - ${public}:/public
@@ -47,9 +41,7 @@ services:
       - "--metrics_dir=/opt/data/test/metrics"
       - "--transfer_dir=/opt/data/test/xfer"
   import:
-    build:
-      context: .
-      dockerfile: docker/import/Dockerfile
+    image: ghcr.io/noaa-gsl/vxingest/import:main
     volumes:
       - ${data}:/opt/data
     secrets: