CircleCI invented many of their own problems. No API to trigger workflow runs and the only trigger “API” is pushing to a git branch. A horrible job-centric UI when all you really care about are workflows. Workflows that don’t let you express conditionality and assume all errors are fatal. A broken data model that confuses the same workflow on different branches with different workflows (no good way to figure out how long your PR workflow takes on average because each PR is it’s own workflow, for some reason). No good state management or data passing options. Hopefully they will sort those things out, but it feels like they went out of their way to build a thing with a crazy data model and triggers that are tightly coupled to github.