I am not sure how much of an obstacle it is in reality that contributors who create their first PR also need to sign the CLA. However, there are mechanisms to make the signing of the CLA during a PR easier: https://cla-assistant.io/
I am not sure how much of an obstacle it is in reality that contributors who create their first PR also need to sign the CLA. However, there are mechanisms to make the signing of the CLA during a PR easier: https://cla-assistant.io/