feat(k8s): enable relative volume paths for kind deployments

Makes kind deployments use the same volume pattern as Docker Compose:
./data/{volume-name} relative to deployment directory.

Changes:
- Allow relative paths for kind (single host, like Docker Compose)
- Default kind volumes to ./data/ instead of provisioner-managed PVCs
- Update Caddy manifest to use hostPath /mnt/caddy-data
- Add caddy-data infrastructure volume support in kind mounts

This enables Caddy certificate persistence across cluster recreation
without requiring system-level directories like /opt/caddy-data.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

stack_orchestrator/data/k8s/components/ingress/ingress-caddy-kind-deploy.yaml

@@ -243,26 +243,12 @@ spec:
               mountPath: /config
       volumes:
         - name: caddy-data
-          persistentVolumeClaim:
-            claimName: caddy-data-pvc
+          hostPath:
+            path: /mnt/caddy-data
+            type: DirectoryOrCreate
         - name: caddy-config
           emptyDir: {}
 ---
-apiVersion: v1
-kind: PersistentVolumeClaim
-metadata:
-  name: caddy-data-pvc
-  namespace: caddy-system
-  labels:
-    app.kubernetes.io/name: caddy-ingress-controller
-    app.kubernetes.io/instance: caddy-ingress
-spec:
-  accessModes:
-    - ReadWriteOnce
-  resources:
-    requests:
-      storage: 1Gi
----
 apiVersion: networking.k8s.io/v1
 kind: IngressClass
 metadata:

stack_orchestrator/deploy/deployment_create.py

@@ -452,17 +452,21 @@ def init_operation(
         volume_descriptors = {}
         configmap_descriptors = {}
         for named_volume in named_volumes["rw"]:
-            if "k8s" in deployer_type:
+            if deployer_type == "k8s":
+                # Full k8s: use provisioner-managed volumes
                 volume_descriptors[named_volume] = None
             else:
+                # Docker Compose and kind: use relative paths
                 volume_descriptors[named_volume] = f"./data/{named_volume}"
         for named_volume in named_volumes["ro"]:
-            if "k8s" in deployer_type:
+            if deployer_type == "k8s":
+                # Full k8s: configmaps or provisioner-managed
                 if "config" in named_volume:
                     configmap_descriptors[named_volume] = f"./configmaps/{named_volume}"
                 else:
                     volume_descriptors[named_volume] = None
             else:
+                # Docker Compose and kind: use relative paths
                 volume_descriptors[named_volume] = f"./data/{named_volume}"
         if volume_descriptors:
             spec_file_content["volumes"] = volume_descriptors
@@ -509,10 +513,13 @@ def _create_deployment_file(deployment_dir: Path):
 
 
 def _check_volume_definitions(spec):
-    if spec.is_kubernetes_deployment():
+    # Kind allows relative paths (single host, like Docker Compose)
+    # Full k8s requires absolute paths (pods could run on any node)
+    if not spec.is_kubernetes_deployment() or spec.is_kind_deployment():
+        return
+
     for volume_name, volume_path in spec.get_volumes().items():
-            if volume_path:
-                if not os.path.isabs(volume_path):
+        if volume_path and not os.path.isabs(volume_path):
             raise Exception(
                 f"Relative path {volume_path} for volume {volume_name} not "
                 f"supported for deployment type {spec.get_deployment_type()}"

stack_orchestrator/deploy/k8s/helpers.py

@@ -238,6 +238,18 @@ def _make_absolute_host_path(data_mount_path: Path, deployment_dir: Path) -> Pat
 def _generate_kind_mounts(parsed_pod_files, deployment_dir, deployment_context):
     volume_definitions = []
     volume_host_path_map = _get_host_paths_for_volumes(deployment_context)
+
+    # Add infrastructure volumes (not defined in compose files)
+    for infra_volume in ["caddy-data"]:
+        if infra_volume in volume_host_path_map and volume_host_path_map[infra_volume]:
+            host_path = _make_absolute_host_path(
+                volume_host_path_map[infra_volume], deployment_dir
+            )
+            container_path = get_kind_pv_bind_mount_path(infra_volume)
+            volume_definitions.append(
+                f"  - hostPath: {host_path}\n" f"    containerPath: {container_path}\n"
+            )
+
     # Note these paths are relative to the location of the pod files (at present)
     # So we need to fix up to make them correct and absolute because kind assumes
     # relative to the cwd.