Regression since 0.4.0: unable to use TokenSource.Environment("GITHUB_USERTOKEN") as an optional token source

[stravissimo]

Related to #16

You can compose these using ||, which should resolve the issue, at least in theory

I have this in my project:

githubTokenSource in ThisBuild := TokenSource.GitConfig("github.token") || TokenSource.Environment("GITHUB_USERTOKEN") || TokenSource.Environment("GITHUB_TOKEN")

When I open sbt and peform update, I get following error:

(credentials) unable to locate a valid GitHub token from Environment(GITHUB_TOKEN)

I have the token present in the .githubconfig file, therefore I do not understand why it is trying to load it from GITHUB_TOKEN. The configuration has worked fine with 0.3.1 and 0.3.2, but not with 0.4.0

It is possible to define a dummy GITHUB_TOKEN environment variable as as a workaround.

[stravissimo]

Bot account used to post the issue by mistake.