See the build log: https://gitlab.com/emmeline/bexp/-/jobs/222647788
The error is:
[ERROR] /builds/emmeline/bexp/.opam exists, but does not appear to be a valid opam root. Please remove it and use `opam init', or specify a different `--root' argument
Reading the source code, it looks like this error occurs when
.opam/config does not exist:
Indeed, when I rename
.opam/config to something else on my own computer, I am able to cause the error message.
However, judging from the CI build output,
.opam/config clearly exists. What gives?