ci(lesavka): use pvc workspace for rust agents

Jenkinsfile

@@ -3,6 +3,7 @@ pipeline {
     kubernetes {
       label 'lesavka-tests-disk'
       defaultContainer 'rust-ci'
+      workspaceVolume dynamicPVC(accessModes: 'ReadWriteOnce', requestsSize: '40Gi', storageClassName: 'longhorn')
       yaml """
 apiVersion: v1
 kind: Pod
@@ -34,17 +35,6 @@ spec:
       volumeMounts:
         - name: workspace-volume
           mountPath: /home/jenkins/agent
-  volumes:
-    - name: workspace-volume
-      ephemeral:
-        volumeClaimTemplate:
-          spec:
-            accessModes:
-              - ReadWriteOnce
-            storageClassName: longhorn
-            resources:
-              requests:
-                storage: 40Gi
 """
     }
   }