[Feature Request]: Allow passing additional data to cloud init to create files and run scripts

[rombert]

Description

This was discussed at #948 . Briefly, my goal is to be able to configure and start a custom Wireguard service on all provisioned nodes. To do that, I think we should expose two additional variables and end up in

• write_files:

  terraform-hcloud-kube-hetzner/modules/host/templates/cloudinit.yaml.tpl

  Line 5 in e79cfc7

  write_files:

• runcmd:

  terraform-hcloud-kube-hetzner/modules/host/templates/cloudinit.yaml.tpl

  Line 25 in e79cfc7

  ${cloudinit_runcmd_common}

The variables should initially be empty and have per-host values, since Wireguard keys cannot be shared.

I plan to work on a pull request sometime in October, but I won't mind if someone else works on it first :-)

[mysticaltech]

@M4t7e @ifeulner @aleksasiriski Please, I would like your input on that people 🙏

[mysticaltech]

@rombert Is your current implementation open-source? If so, please do share your modified cloud-init.yaml.tpl, if not, no worries.

[rombert]

@mysticaltech - I don't have a modification yet, I just tested this out my manually speciying cloud-init data for one VM. Nothing done in terraform yet.

[mysticaltech]

(Quick tip, I do not know how familiar you are with terraform, but GPT-4 sure is a decent expert, I personally use it all the time now 😄)

[Silvest89]

@mysticaltech It should be configurable per node and not nodepool? This is fairly easy to implement though

[mysticaltech]

@Silvest89 It would make sense to me per nodepool indeed! PR most welcome 🙏