Testing preview versions

    This is handy as if you do not want to compile e.g the master branch to test a fix.

    You can create a cluster using these markers using the following scripts:

    Testing a pull request

    When a PR builds successfully, you can test the PR using the following script:

    1. sha=$(curl -s -H "Accept: application/vnd.github.v3+json" https://api.github.com/repos/kubernetes/kops/pulls/${pr} | jq -r .head.sha )
    4. ./kops version