Add Windows support

[stevehipwell]

As of Helm v3.18.0 you can use platformHooks to enable installation on Windows. For reference you can take a look at databus23/helm-diff#712.

[applejag]

I've noticed that setting platformHooks makes this break for older Helm versions. I've had some of my CI/CD systems break from this.

So I'd like to not be too eager to add this and instead add it a little later.

And when we add it we need to be clear in our release notes that this is a breaking change.

[stevehipwell]

@applejag due to the way Helm plugins work this is a breaking change, as is any modification to the plugin YAML. AFAIK this will be required for Helm v4.

[stevehipwell]

👀

[applejag]

Haven't forgotten. Just haven't had the will to work on this.

If you do, then we do accept contributions

[stevehipwell]

@applejag I used my innovation tokens up on adding the platform hooks support to Helm. If I can find a spare few mins I may be able to look at the scripts used by helm-diff or helm-unittest.