Publish provider to HashiCorp Terraform Registry

[FRosner]

Problem

With newer Terraform versions the custom plugin integration works differently:
It will now check ~/.terraform.d/plugins/${name}/${version}/${os}${arch} or %APPDATA%\terraform.d\plugins${name}${version}${os}${arch} (Windows).
This seems a little cumbersome to me. It might be better to publish the provider to the HashiCorp Terraform Registry , which seems easy enough: https://www.terraform.io/docs/registry/providers/publishing.html

ToDo

• Document Provider
• Tag with vx.z.y
• Switch to github actions
  • Update CI pipeline to publish GitHub releases
  • Add GPG public key to organization (codecentric) namespace in Terraform Provider Registry. Apparently this needs an admin.