(for PR #27814)

2025-04-24 14:19.28: New job: Lint
2025-04-24 14:19.28: Checking out commit ff55db32. To reproduce:
                       git clone --recursive "https://github.com/ocaml/opam-repository.git" && cd "opam-repository" && git fetch origin "refs/pull/27814/head" && git reset --hard ff55db32
2025-04-24 14:19.28: Exec: "cp" "-a" "--" "/var/lib/ocurrent/var/git/opam-repository.git-a0bc4b41ddb868605dc1500002c27cfa79faf4389fe53b6754817ea16b48d458/.git" 
                           "/tmp/git-checkout20701893"
2025-04-24 14:19.30: Exec: "git" "-C" "/tmp/git-checkout20701893" "submodule" 
                           "deinit" "--force" "--all"
2025-04-24 14:19.30: Exec: "git" "-C" "/tmp/git-checkout20701893" "reset" 
                           "--hard" "-q" "ff55db326db9c2958d536c00557c75e835658f3e"
2025-04-24 14:19.34: Exec: "git" "-c" "protocol.file.allow=always" "-C" 
                           "/tmp/git-checkout20701893" "submodule" "update" 
                           "--recursive" "--init" "--no-fetch"
2025-04-24 14:19.35: Exec: "git" "merge" "-q" "--" "8106bcf57fc33218275bbf0d02e725f4e9fcd0f6"

To reproduce locally, on the opam-repository PR branch, run: 

    opam pin opam-ci-check git+https://github.com/ocurrent/opam-repo-ci.git#live
    opam-ci-check lint --opam-repository . core_unix.v0.17.1:new=false

2025-04-24 14:19.35: Exec: "opam-ci-check" "lint" "--opam-repository" 
                           "." "core_unix.v0.17.1:new=false"
Linting opam-repository at /tmp/git-checkout20701893/. ...
Error in core_unix.v0.17.1: conf packages should always use the 'conf-' name prefix, the 'conf' flag, and the 'depext' field all together, but this package only has a non-empty 'depext' field
2025-04-24 14:19.50: Job failed: Error in core_unix.v0.17.1: conf packages should always use the 'conf-' name prefix, the 'conf' flag, and the 'depext' field all together, but this package only has a non-empty 'depext' field