I won't trust Harness with anything open source. It's the same company that killed the open source Drone CI after acquiring it. They changed the license such that you could contribute to it but could not use it if your revenue was more than 1 million USD. They didn't fix bugs that were well known to them because they were working on the enterprise version of it.
I went to check on this, and it seems that https://github.com/harness/drone redirects to harness/gitness. I'm now very confused.
The "Community Edition" links on https://docs.drone.io/ are all broken because of this.