Add app & environment variant override support

[mrizk]

Describe the feature request

At the moment, the SDK doesn't support setting a variant override for appName / environment despite this being supported by Unleash. Only userId, sessionId, and remoteAddress are supported.

unleash-client-go/api/variant.go

Line 55 in 10a3338

func (o Override) getIdentifier(ctx *context.Context) string {

This is a trivial feature to support, I could open a PR but wasn't sure what the contribution guidelines are on this project.

Background

No response

Solution suggestions

Add cases for appName & environment to Override.getIdentifier() and return their values from the context.

[ivarconr]

This is a trivial feature to support, I could open a PR but wasn't sure what the contribution guidelines are on this project.

Great, please feel free to open a PR.

[mrizk]

@ivarconr done

[sighphyre]

Thanks for patching this @mrizk, it's definitely a missing feature in the SDK but from a perspective of the wider Unleash ecosystem, not having that is a bug so I've done a patch release for this

Appreciate the contribution!