When Pulse runs in Docker inside a Proxmox LXC container, users need
specific instructions to retrieve the bootstrap token. Added pct exec
and pct enter commands to the Docker instructions section.
Now shows three scenarios:
1. Direct Docker host: docker exec
2. Kubernetes: kubectl exec
3. Proxmox LXC with Docker: pct exec / pct enter
This makes first-time setup easier for users deploying Pulse in LXC
containers on Proxmox.
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