Pull request tests are building on the wrong repository

[albertyw]

I've noticed that many of the currently open pull requests are failing on the last step because the build is trying to checkout the test branch from the buildkite-plugins repository rather than the forked repository. This can be most easily seen in #174 (build) and #175 (build). They have logs of the form

  | [2021-01-11T04:53:08Z] $ git clone -v -- https://github.com/buildkite-plugins/docker-buildkite-plugin.git .
...
  | [2021-01-11T04:53:08Z] # Checking out `866a6bc4b36af4af0a7b75118177092333c8b0b9`

The commit hash exists on github.com:albertyw/docker-buildkite-plugin and not on github.com:buildkite-plugins/docker-buildkite-plugin

[chloeruka]

Hey @albertyw – good catch! Thanks for pointing this out. I'm drafting a fix for this, I'll aim to roll it out shortly.