Function replica_id

crates/openshell-server/src/compute/lease.rs:246–250

Derive a stable replica identity for lease ownership. Kubernetes sets `HOSTNAME` to the pod name, Docker sets it to the container ID, and systemd units inherit the machine hostname. `OPENSHELL_REPLICA_ID` allows explicit override. The UUID fallback handles edge cases where neither env var is set.

()

/// `OPENSHELL_REPLICA_ID` allows explicit override. The UUID fallback
/// handles edge cases where neither env var is set.
pub fn replica_id() -> String {
    std::env::var("OPENSHELL_REPLICA_ID")
        .or_else(|_| std::env::var("HOSTNAME"))
        .unwrap_or_else(|_| uuid::Uuid::new_v4().to_string())
}

#[cfg(test)]
mod tests {