Only wait up to 5 seconds to mount nfs

[djeebus]

Failures to mount are currently causing envd to block and api requests to timeout. No reason for that.

---

[cursor]

PR Summary

Medium Risk
Changes init-time volume mounting behavior by adding a 5s timeout and skipping/deduping mounts, which could leave volumes unmounted in slow or transient NFS scenarios but avoids request hangs.

Overview
This PR makes /init NFS volume mounting non-blocking for overall system responsiveness by adding a 5-second mount timeout, preventing concurrent re-mount attempts, and tracking already-mounted paths so repeated init calls don’t re-run mounts; it also bumps the envd version to 0.5.11.

^{Reviewed by Cursor Bugbot for commit 78d5310. Bugbot is set up for automated code reviews on this repo. Configure here.}

[claude]

Removing the cluster_size >= 1 validation is a regression. Without it, cluster_size = 0 is silently accepted at plan time, which would result in a zero-node worker cluster. If autoscaling can manage the count to zero that is fine, but then the validation should be >= 0 rather than removed entirely.

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[chatgpt-codex-connector]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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