Enable build CI for Windows/MacOS to improve multi-platform compatibility

[LucaGuerra]

In https://github.com/falcosecurity/libs/ we are able to perform some basic builds on platforms that are not Linux, namely Windows and MacOS. While we don't provide specific artifacts for those platforms there's no reason why the main code shouldn't be multiplatform, especially since we can now build cross platform plugins. Of course kmod or ebpf are strictly Linux-only but the generic code should work. Given the fact that we're also working on WASM this effort might be much less than expected.

[therealbobo]

/assign

[poiana]

Issues go stale after 90d of inactivity.

Mark the issue as fresh with /remove-lifecycle stale.

Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Provide feedback via https://github.com/falcosecurity/community.

/lifecycle stale

[therealbobo]

I think we can close this. cc @LucaGuerra