(for PR #27816)

2025-04-24 14:25.37: New job: Lint
2025-04-24 14:25.37: Checking out commit c45383e4. To reproduce:
                       git clone --recursive "https://github.com/ocaml/opam-repository.git" && cd "opam-repository" && git fetch origin "refs/pull/27816/head" && git reset --hard c45383e4
2025-04-24 14:25.37: Exec: "cp" "-a" "--" "/var/lib/ocurrent/var/git/opam-repository.git-a0bc4b41ddb868605dc1500002c27cfa79faf4389fe53b6754817ea16b48d458/.git" 
                           "/tmp/git-checkout312236f"
2025-04-24 14:25.38: Exec: "git" "-C" "/tmp/git-checkout312236f" "submodule" 
                           "deinit" "--force" "--all"
2025-04-24 14:25.39: Exec: "git" "-C" "/tmp/git-checkout312236f" "reset" 
                           "--hard" "-q" "c45383e45327f17c44cd719eb47697ec7fbff368"
2025-04-24 14:25.43: Exec: "git" "-c" "protocol.file.allow=always" "-C" 
                           "/tmp/git-checkout312236f" "submodule" "update" 
                           "--recursive" "--init" "--no-fetch"
2025-04-24 14:25.43: 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.v0.15.2:new=false

2025-04-24 14:25.44: Exec: "opam-ci-check" "lint" "--opam-repository" 
                           "." "core_unix.v0.15.2:new=false"
Linting opam-repository at /tmp/git-checkout312236f/. ...
Error in core_unix.v0.15.2: 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 14:26.01: Job failed: Error in core_unix.v0.15.2: 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