If I had to guess, for some reason git is not installed in the VM Rancher is running, although that seems like a weird oversight

you can always use rdctl shell to poke around the VM itself

Thanks, I did that, and indeed git is not there …

yup the VM is designed to run a certain set of things and guessing folks were not thinking dynamic activities outside of the container scope

I guess this build usage isn’t that common in a compose file for some reason

I wonder if there is any difference if you run

docker compose

rather than

docker-compose

? I'm guessing it will be the same but it's worth a shot