## Why ?
I'm using Zsh (and I'm not the only one 🤣). Pulumi having Zsh completions is great. I will also add completions to the Homebrew Formula when this is merged.
## Why not use Cobra `GenZshCompletion`
It's currently not good enough. Maybe it will be when spf13/cobra#646 is done.
## Implementation
I did the same thing `kubectl` does for Zsh completion. Meaning using the bash completion generated by Cobra and adapting it to a zsh format. The resulting zsh completion file is not perfect (compared to one's where you have a short command description in the output) but it's good enough I think.
I also changed the file output to a stdout output. I think it's better than outputting to a file and it will make adding completions in Homebrew straightforward. I don't know if the previous `gen-bash-completion` is used in any Pulumi project so this may break things.
