fix(ci): move PVC mount to /mnt/training-data (avoids Redis /data conflict)

Redis image WORKDIR is /data and entrypoint runs chown recursively.
PVC mounted at /data/training was read-only, causing chown to fail
with exit code 1, crashing the Redis sidecar.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitlab-ci.yml

@@ -17,8 +17,8 @@ variables:
   CUDA_COMPUTE_CAP: "90"
   # Stable JWT secret for api_gateway tests (prevents env-var race between parallel tests)
   JWT_SECRET: "CiTestSecret_Kx7mP9nR2sW5vY8bC3fG6jH1kL4pQ7tZ0uN9dM5eV8xS2wT6yA4zB_64chars_min"
-  # Training data on block storage PVC (mounted at /data/training by runner)
-  FOXHUNT_DATA_DIR: "/data/training/futures-baseline"
+  # Training data on block storage PVC (mounted at /mnt/training-data by runner)
+  FOXHUNT_DATA_DIR: "/mnt/training-data/futures-baseline"
   SCCACHE_BUCKET: $SCCACHE_BUCKET
   SCCACHE_ENDPOINT: $SCCACHE_ENDPOINT
   SCCACHE_S3_USE_SSL: "true"

infra/k8s/gitlab/runner-values.yaml

@@ -47,9 +47,10 @@ runners:
       [runners.kubernetes.pod_labels]
         "app.kubernetes.io/part-of" = "foxhunt-ci"
       # Mount training data PVC (Databento futures .dbn.zst files)
+      # Path must NOT be under /data — Redis image's WORKDIR is /data and entrypoint chowns it
       [[runners.kubernetes.volumes.pvc]]
         name = "training-data-pvc"
-        mount_path = "/data/training"
+        mount_path = "/mnt/training-data"
         read_only = true
 
   # Runner tags for job matching