Add the option for assigning a specific SSH key to a node. (#1356)

* Add the option for specifying an SSH key.

* Add ability to specify SSH key.

* Update config.sample.yaml

* Update config.sample.yaml

* Update bootstrap/templates/ansible/inventory/hosts.yaml.j2

* Update bootstrap/templates/ansible/inventory/hosts.yaml.j2

---------

Co-authored-by: Devin Buhl <onedr0p@users.noreply.github.com>

bootstrap/templates/ansible/inventory/hosts.yaml.j2

@@ -8,6 +8,9 @@ kubernetes:
         "#{ item.name }#":
           ansible_user: "#{ item.ssh_user }#"
           ansible_host: "#{ item.address }#"
+          #% if item.ssh_key %#
+          ansible_ssh_private_key_file: "#{ item.ssh_key }#"
+          #% endif %#
         #% endif %#
         #% endfor %#
     #% if bootstrap_node_inventory | selectattr('controller', 'equalto', False) | list | length %#
@@ -18,6 +21,9 @@ kubernetes:
         "#{ item.name }#":
           ansible_user: "#{ item.ssh_user }#"
           ansible_host: "#{ item.address }#"
+          #% if item.ssh_key %#
+          ansible_ssh_private_key_file: "#{ item.ssh_key }#"
+          #% endif %#
         #% endif %#
         #% endfor %#
     #% endif %#