chore: add discord notifier

# See https://docs.gitlab.com/ee/api/releases/

# We can only control the link to the hub, the release is still storing the source code

template_release:

  after_script:

    # We notify the release to Discord

    - cd ${RELEASE_PATH}

    - |

      for release in *; do

        if [[ $release =~ ^(.*)@(.*)\.(.*)\.md$ ]]; then

          JOB="${BASH_REMATCH[1]}"

          VERSION="${BASH_REMATCH[2]}"

          STAGE="${BASH_REMATCH[3]}"

          changelog=$(cat "$release")

          echo "New version detected for $job-$version, sending notification to discord"

          pipenv run python tools/notify/discord_release_notify.py -n ${JOB} -v ${VERSION} -c "${CHANGELOG}" -s ${STAGE}

        fi

      done

  rules:

   - if: '$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH && $CI_PROJECT_PATH_SLUG == "r2devops-hub"'