[self-hosted] Make our Self-Hosted terraform scripts infrastructure only

[geropl]

Currently our terraform scripts are geared towards a "one-step" install experience as they were meant to be included in the installer images. After we remove those images, we should try to make them work again by:

• make the terraform scripts infrastructure only, without the actual Gitpod installation
• thus make them work again (fix Wrong value of DB_ENCRYPTION_KEYS #3766 along the way)
• update the docs to reflect the two-step nature:
  1. run provider-specific terraform script (output: values.terraform.yaml)
  2. run (generic) helm install

/cc @wulfthimm

[fullmetalrooster]

That would be no problem.

[asthomasdk]

Would be nice to see this in action ;-)

I've been trying for most of a week now to get a working setup with my own terraform for a Hetzner K3s cluster, managed by Rancher 2.5 - and many iterations of trying to get gitpod to work on top of that. A clear set of (working) steps on how to go from zero to Gitpod hero on a simple infrastructure would be great to have.

[geropl]

This is issue is superseded by now.