Accept initial worker node labels and taints map on bare-metal

* Add `worker_node_labels` map from node name to a list of initial
node label strings
* Add `worker_node_taints` map from node name to a list of initial
node taint strings
* Unlike cloud platforms, bare-metal node labels and taints
are defined via a map from node name to list of labels/taints.
Bare-metal clusters may have heterogeneous hardware so per node
labels and taints are accepted
* Only worker node names are allowed. Workloads are not scheduled
on controller nodes so altering their labels/taints isn't suitable

```
module "mercury" {
  ...

  worker_node_labels = {
    "node2" = ["role=special"]
  }

  worker_node_taints = {
    "node2" = ["role=special:NoSchedule"]
  }
}
```

Related: https://github.com/poseidon/typhoon/issues/429

bare-metal/container-linux/kubernetes/cl/worker.yaml

@@ -93,6 +93,12 @@ systemd:
           --lock-file=/var/run/lock/kubelet.lock \
           --network-plugin=cni \
           --node-labels=node.kubernetes.io/node \
+          %{~ for label in compact(split(",", node_labels)) ~}
+          --node-labels=${label} \
+          %{~ endfor ~}
+          %{~ for taint in compact(split(",", node_taints)) ~}
+          --register-with-taints=${taint} \
+          %{~ endfor ~}
           --pod-manifest-path=/etc/kubernetes/manifests \
           --read-only-port=0 \
           --volume-plugin-dir=/var/lib/kubelet/volumeplugins

bare-metal/container-linux/kubernetes/profiles.tf

@@ -188,6 +188,8 @@ data "template_file" "worker-configs" {
     cluster_dns_service_ip = module.bootstrap.cluster_dns_service_ip
     cluster_domain_suffix  = var.cluster_domain_suffix
     ssh_authorized_key     = var.ssh_authorized_key
+    node_labels            = join(",", lookup(var.worker_node_labels, var.workers.*.name[count.index], []))
+    node_taints            = join(",", lookup(var.worker_node_taints, var.workers.*.name[count.index], []))
   }
 }
 

bare-metal/container-linux/kubernetes/variables.tf

@@ -55,6 +55,18 @@ variable "clc_snippets" {
   default     = {}
 }
 
+variable "worker_node_labels" {
+  type = map(list(string))
+  description = "Map from worker names to lists of initial node labels"
+  default = {}
+}
+
+variable "worker_node_taints" {
+  type = map(list(string))
+  description = "Map from worker names to lists of initial node taints"
+  default = {}
+}
+
 # configuration
 
 variable "k8s_domain_name" {