fix(jellyfin): add writable /tmp directory for migration

Signed-off-by: Vegard Hagen <[email protected]>

k8s/apps/media/jellyfin/deployment.yaml

@@ -52,6 +52,8 @@ spec:
               mountPath: /mnt/media
             - name: cache
               mountPath: /cache
+            - name: tmp
+              mountPath: /tmp
       volumes:
         - name: config
           persistentVolumeClaim:
@@ -63,3 +65,5 @@ spec:
         - name: cache
           emptyDir:
             medium: Memory
+        - name: tmp
+          emptyDir: { }