[DevOps] Add CodeClimate style fomatter to use apigee-lint into GitLab CI/CD

[ipierre1]

Linked to issue : #427

To use full functionnalities on GitLab CI/CD, it would be nice to implement codeclimate formatter to use codequality reports artifact into pipeline job artifacts as bellow:

apigeelint:
  stage: lint
  image: node:12-alpine
  before_script:
    - npm install -g apigeelint
  script:
    - apigeelint -f codeclimate.js > apigeelint-results.json
  artifacts:
    reports:
      codequality:
        - "${CI_PROJECT_DIR}/apigeelint-results.json"

Code Quality of GitLab use CodeClimate json format, with enforcement on fingerprint which is not optional for GitLab CI/CD.

Codequality : https://docs.gitlab.com/ee/ci/testing/code_quality.html
Codeclimate specification : https://github.com/codeclimate/platform/blob/master/spec/analyzers/SPEC.md#data-types

[google-cla]

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[ssvaidyanathan]

Thanks for the PR @ipierre1

Can you pls sign the Contributor License Agreement (CLA) so that I can merge and release this version

[ipierre1]

Hi @ssvaidyanathan ,

Yes, I just sign CLA with my GitHub username. Thanks in advance

[ssvaidyanathan]

Its still not approved --> https://github.com/apigee/apigeelint/pull/429/checks?check_run_id=22844353512

[ipierre1]

Its still not approved --> https://github.com/apigee/apigeelint/pull/429/checks?check_run_id=22844353512

Sorry I hadn't clicked on the re-scan button, now on the checks page it appears green.