Automation related to fluent-bit infrastructure

Changes are managed by (PRs), the required votes (+1) should pass together with the terraform checks (lint/fmt/validate).

To add Github repositories do this manually via the fluent organization with appropriate privileges in Github. Once complete, make sure to import them as github_repository.XXX items under Terraform to then manage the rest. Terraform is not used for repository creation, only management after that.

For adding domains, edit terraform/domains.tf with the required subdomain changes and submit a PR.

For adding machines, edit terraform/machines.tf with the name of the machines to be imported from packet API.

Currently managed secrets are:

TF_API_TOKEN
CLOUDFLARE_TOKEN
PACKET_NET_TOKEN