This lets us use labels (or annotations), meaning we can experiment
with different clouds without changing the API.
We also add initial (experimental/undocumented) support for exposing a "Metal" provider.
Rather than downloading the hash every time, we can record the hashes
for our well-known assets and bake them into the kOps binary. If the
hash is not baked in, we will continue to fall-back to downloading it,
this is important for new k8s versions, or where the user specifies a
version of one of our well-known assets (such as containerd).
Ciprian Hacman