We have a public repository at https://github.com/mui-org/material-ui with pipelines at https://app.circleci.com/pipelines/github/mui-org/material-ui.
However, on passing or failing jobs (e.g. https://app.circleci.com/pipelines/github/mui-org/material-ui/29404/workflows/fbebb11e-8463-4ec0-99d3-900396632a56/jobs/203886) users that are not logged in are redirected to CircleCIs login page. Since these runs are linked from pull requests, contain important information why a build is failing and the project is public, people should not be required to login.
For comparison, builds on Azure Pipelines (https://dev.azure.com/mui-org/Material-UI/_build/results?buildId=20215&view=results) or GitHub actions (https://github.com/mui-org/material-ui/runs/1544044072?check_suite_focus=true) are reachable without login.
We have “free and open source” enabled in advanced settings.