Method release_gpu

crates/openshell-driver-vm/src/driver.rs:1327–1333

(&self, sandbox_id: &str)

    }

    fn release_gpu(&self, sandbox_id: &str) {
        if let Some(inventory) = self.gpu_inventory.as_ref()
            && let Ok(mut inv) = inventory.lock()
        {
            inv.release(sandbox_id);
        }
    }

    fn release_subnet(&self, sandbox_id: &str) {
        if let Ok(mut alloc) = self.subnet_allocator.lock() {