Add os matrix containing macos, windows and ubuntu to github workflows

[Alex009]

https://github.com/korlibs/klock/blob/master/.github/workflows/DEPLOY.yml here good sample of publish i think. for windows target do only publish windows task, for linux common and linux publish task, and for macos all others except common

[nrobi144]

@Alex009 as the korlibs example, they are using actuallyPublishBintray which essentially marks the uploaded artifacts as published. We could add a dependency to easy-kotlin-mpp-gradle-plugin and do the same, or implement some alternative.

I've added a possible solution from the official docs to avoid duplicates, though it still needs to be tested

[Alex009]

thx! will try it