Change default lun from lun1 to lun0

[craddm]

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⤴️ Summary

Replaces hard-coded references to lun1 with references to lun0, and changes code so disks added to VMs start from LUN0 instead LUN1. Note that this PR also contains the same devcontainer changes as #1662

🌂 Related issues

Closes #911

🔬 Tests

Tested deployment of resources affected by the change.