Adding install_snippets support.

During the "real" first boot (install boot), we need tu run butane
config to manipulate disks, so we add install_snippets variable to do
so.

This snippets are added to the install.yaml butane configuration

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

@@ -60,6 +60,7 @@ data "ct_config" "install" {
     baseurl_flag = var.cached_install ? "-b ${var.matchbox_http_endpoint}/assets/flatcar" : ""
   })
   strict = true
+  install_snippets = lookup(var.install_snippets, var.controllers.*.name[count.index], [])
 }
 
 # Match each controller by MAC

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

@@ -61,6 +61,12 @@ variable "snippets" {
   default     = {}
 }
 
+variable "install_snippets" {
+  type        = map(list(string))
+  description = "Map from machine names to lists of Container Linux Config snippets to run during install phase"
+  default     = {}
+}
+
 variable "worker_node_labels" {
   type        = map(list(string))
   description = "Map from worker names to lists of initial node labels"

bare-metal/flatcar-linux/kubernetes/worker/matchbox.tf

@@ -55,6 +55,7 @@ data "ct_config" "install" {
     baseurl_flag = var.cached_install ? "-b ${var.matchbox_http_endpoint}/assets/flatcar" : ""
   })
   strict = true
+  snippets = var.install_snippets
 }
 
 # Match a worker to a profile by MAC

bare-metal/flatcar-linux/kubernetes/worker/variables.tf

@@ -60,6 +60,12 @@ variable "snippets" {
   default     = []
 }
 
+variable "install_snippets" {
+  type        = list(string)
+  description = "List of Butane snippets to run with the install command"
+  default     = []
+}
+
 variable "node_labels" {
   type        = list(string)
   description = "List of initial node labels"

bare-metal/flatcar-linux/kubernetes/workers.tf

@@ -22,6 +22,7 @@ module "workers" {
   node_labels           = lookup(var.worker_node_labels, var.workers[count.index].name, [])
   node_taints           = lookup(var.worker_node_taints, var.workers[count.index].name, [])
   snippets              = lookup(var.snippets, var.workers[count.index].name, [])
+  install_snippets      = lookup(var.install_snippets, var.workers[count.index].name, [])
 
   # optional
   download_protocol = var.download_protocol