Kubernetes mode: Multi-Attach error for volume XXX Volume is already used by pod(s) RUNNER POD

[aladdin-atypon]

Describe the bug
github runner in kubernetes mode expects kubernetesModeWorkVolumeClaim, the default is accessModes: ["ReadWriteOnce"], and in most of the doc it's always accessModes: ["ReadWriteOnce"].

However, in kubernetes mode, the runner container hook is expected to create new pod, get the volume from the runner pod and use it there, but it does't work for me since the ReadWriteOnce allows just 1 pod to be mounting the pvc, which is the runner pod, I've seen a lot of examples where aws gp3 storage class is used and no one has complained about the issue I'm facing!

I've tried to use EFS, it works fine, but the point is it's X15 slower than ebs, regardless, how the default is ReadWriteOnce and you expect it to work fine although, by definition, ReadWriteOnce doesn't work with more than one pod but the hook actually uses the same PVC of the runner .

To Reproduce
Steps to reproduce the behavior:

1. Use the following template:
   githubConfigUrl: XXX
   githubConfigSecret:XXX
   runnerGroup: XXX
   template:
   spec:
   securityContext:
   fsGroup: 1001
   containers:
   • name: runner
     image: ghcr.io/actions/actions-runner:latest
     command: [ "/home/runner/run.sh" ]
     env:
     • name: ACTIONS_RUNNER_CONTAINER_HOOKS
       value: /home/runner/k8s/index.js
     • name: ACTIONS_RUNNER_POD_NAME
       valueFrom:
       fieldRef:
       fieldPath: metadata.name
     • name: ACTIONS_RUNNER_REQUIRE_JOB_CONTAINER
       value: "false"
     • name: ACTIONS_RUNNER_USE_KUBE_SCHEDULER
       value: "true"
       volumeMounts:
     • name: work
       mountPath: /home/runner/_work
       volumes:
   • name: work
     ephemeral:
     volumeClaimTemplate:
     spec:
     accessModes: [ "ReadWriteOnce" ]
     storageClassName: "gp3"
     resources:
     requests:
     storage: 1Gi
2. install the arc chart of version 0.9.2, apply any job that creates a contrainer.
3. The created pod with XXX-workflow suffix fails due to Multi-Attach error for volume "pvc-XXX" Volume is already used by pod(s) XXX-s6jpq

Expected behavior
Explain how ReadWriteOnce can be working both both pods at the same time, or change the default doc. so nfs alike FS could be used.

Runner Version and Platform

runner: latest
gha-runner-scale-set-0.9.2

Job Log Output

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