Run opam-ci-check lints before submitting a package As a part of our work to improve package authoring workflows, we have extracted some of the functionality from the opam-repository CI code into a CLI sub-project, opam-ci-check, that can be used locally to run some of the CI steps, including linting. This commit enables running the opam-ci-check lints on a package before submitting it to opam-repository. It also adds a flag to enable running these lints when submitting to a different repository. The `--force` argument can be used to submit the package inspite of any lint errors.