fix(ci): add lua-tests stage to CI pipeline for improved testing coverage

# your pipeline stages

lua-tests:

  stage: test

  image: debian:bookworm-slim

  rules:

    - if: '$CI_PIPELINE_SOURCE == "push"'

      when: always

    - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'

      when: always

    - when: never

  before_script:

    - apt-get update

    - >

      apt-get install -y --no-install-recommends

      bash

      build-essential

      ca-certificates

      git

      liblua5.1-0-dev

      lua5.1

      luarocks

    - luarocks --lua-version=5.1 install busted

    - luarocks --lua-version=5.1 install luacov

    - luarocks --lua-version=5.1 install luacov-cobertura

  script:

    - bash run_tests.sh

  artifacts:

    when: always

    paths:

      - coverage.xml

      - luacov.report.out

      - luacov.stats.out

    reports:

      coverage_report:

        coverage_format: cobertura

        path: coverage.xml

zip-koplugin-release:

  stage: publish

  image: registry.gitlab.com/gitlab-org/cli:latest