feat: ensure sshd is installed (#13)

- ensure the openssh-server package is installed
- this is required for puppet ssh-signing

Reviewed-on: https://git.query.consul/unkin/packer-images/pulls/13

images/almalinux/9.5/puppet-base/variables.auto.pkrvars.hcl

@@ -4,6 +4,7 @@ deploy_files_from_image = true
 use_incus = true
 packages = [
   "htop",
+  "openssh-server",
   "puppet-agent",
   "puppet-initial"
 ]
@@ -13,5 +14,6 @@ scripts_pre_packages = [
 ]
 scripts_final = [
   "dnf clean all",
-  "rm -rf /var/cache/dnf"
+  "rm -rf /var/cache/dnf",
+  "systemctl enable sshd"
 ]