Flag Dockerfile containers for Dagger migration during service review

The service-review checklist now shows a "Dagger Migration" hint when a
container still uses a Dockerfile without a container.py. The review-services
doc also mentions migration as a review step.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/how-to/knowledgebase/review-services.md

@@ -47,6 +47,7 @@ For all service types, start by reading the service's reference card (`docs/refe
 3. Review the upstream changelog for breaking changes
 4. If the service uses a custom-built container, also check the base image for security updates and follow [[build-container-image]] to rebuild
 5. If upgrading, update the manifest and follow [[deploy-k8s-service]]
+6. If the container still uses a Dockerfile (no `container.py`), consider migrating to a native Dagger build — see the `containers/navidrome/container.py` pattern for reference
 
 ### Ansible Services (`type: ansible`)
 

mise-tasks/service-review

@@ -21,7 +21,6 @@ After reviewing, update the service entry in the YAML file:
 Usage: mise run service-review [-- --limit 15] [-- --type argocd]
 """
 
-import sys
 from datetime import date
 from pathlib import Path
 from typing import Annotated
@@ -166,12 +165,25 @@ def main(
     ]
 
     svc_type = top_svc.get("type", "")
+    container_dir = Path(__file__).parent.parent / "containers" / top_svc["name"]
+    has_dockerfile_only = (
+        (container_dir / "Dockerfile").exists()
+        and not (container_dir / "container.py").exists()
+    )
+
     if svc_type == "argocd":
         checklist_parts += [
             "\n[bold]ArgoCD Deployment:[/bold]\n",
             "• Update image tag in argocd/manifests/<service>/kustomization.yaml\n",
             f"• Verify sync status: argocd app get {top_svc['name']}\n",
         ]
+        if has_dockerfile_only:
+            checklist_parts += [
+                "\n[bold yellow]Dagger Migration:[/bold yellow]\n",
+                "• This container still uses a Dockerfile (no container.py)\n",
+                "• Consider migrating to a native Dagger build for better error visibility\n",
+                f"• See containers/{top_svc['name']}/Dockerfile\n",
+            ]
     elif svc_type == "ansible":
         checklist_parts += [
             "\n[bold]Ansible Deployment:[/bold]\n",