feat: add init container for model initialization and change models volume to emptyDir

manifests/home-services/tts-gateway.yaml

@@ -31,6 +31,26 @@ spec:
           effect: NoSchedule
       imagePullSecrets:
         - name: gitea-registry-secret
+      # Populates the shared `models` emptyDir from the tts-model image before tts-sidecar
+      # starts - see tts-gateway/model/Dockerfile in the home-service repo (the checkpoint/
+      # hparams are committed there directly and CI builds+pushes this image like the other
+      # four). Mounted at /dest, not /models: the model image already has the files baked in
+      # at /models in its own layer, so mounting the shared volume there would shadow the
+      # very files this container needs to copy from.
+      initContainers:
+        - name: model-init
+          image: gitea.nik4nao.com/nik/tts-model:latest
+          command: ["cp", "-a", "/models/.", "/dest/"]
+          volumeMounts:
+            - name: models
+              mountPath: /dest
+          resources:
+            requests:
+              cpu: 10m
+              memory: 16Mi
+            limits:
+              cpu: 100m
+              memory: 64Mi
       containers:
         - name: tts-gateway
           image: gitea.nik4nao.com/nik/tts-gateway:latest
@@ -118,14 +138,12 @@ spec:
         - name: tls
           secret:
             secretName: tts-gateway-tls
-        # Checkpoint/config aren't baked into the sidecar image (still an
-        # open decision per tts-gateway/README.md) - bind-mounted from
-        # /data/tts-gateway on nik-gpu instead. Populate with G_790000.pth
-        # and uma.json before this Deployment will go Ready.
+        # Populated at pod start by the model-init init container above, copying from the
+        # versioned gitea.nik4nao.com/nik/tts-model image - not a hostPath into nik-gpu's raw
+        # disk, so this survives node reprovisioning and isn't tied to manual file placement.
         - name: models
-          hostPath:
-            path: /data/tts-gateway
-            type: Directory
+          emptyDir:
+            sizeLimit: 1Gi
 ---
 apiVersion: v1
 kind: Service