Cancel a running build (passed through)
409 ci_finished when it has finished. Needs write_builds.
POST
https://app.gitpando.com/v1/monorepos/{owner}/{monorepo}/ci/builds/{build}/cancel409 ci_finished when it has finished. Needs write_builds.
https://app.gitpando.com/v1/monorepos/{owner}/{monorepo}/ci/builds/{build}/cancel