The changes in this PR are in preparation for transferring this repo from
the HashiCorp org to the HetznerCloud org, where this plugin will be maintained.
[x] Update CODEOWNERS
[x] Remove HashiCorp specific GPG signing from release
[x] Remove GitHub secrets specific to HashiCorp repo.
The changes in this PR are in preparation for transferring this repo from the HashiCorp org to the HetznerCloud org, where this plugin will be maintained.