fix: mount emptyDir to /.cache to fix Prisma permissions

ai-core/litellm/deployment.yaml

@@ -75,6 +75,8 @@ spec:
             - name: config
               mountPath: /etc/litellm
               readOnly: true
+            - name: cache
+              mountPath: /.cache
           resources:
             requests:
               cpu: 250m
@@ -84,10 +86,12 @@ spec:
               memory: 2Gi
           securityContext:
             allowPrivilegeEscalation: false
-            readOnlyRootFilesystem: false   # litellm writes temp files
+            readOnlyRootFilesystem: false
             capabilities:
               drop: ["ALL"]
       volumes:
         - name: config
           configMap:
             name: litellm-config
+        - name: cache
+          emptyDir: {}