How to merge tag lists from two job definitions put together with "extends"

GitLab CI/CD
,
1

In .gitlab-ci.yml I import several files, including templates.yml and staging-new.yml

templates.yml has templates for jobs used in many other places. A template there may look like this:

.build-image:
  stage: Build
  tags:
    - $RUNNER_XLARGE
  script:
    - scripts/build_image.sh

In staging-new.yml I have a generic template for jobs in that environment:

.staging-new:
  variables:
    RUNNER_SMALL: worker-xsmall
    RUNNER_XLARGE: worker-medium
    RUNNER_4XLARGE: worker-large
  tags:
    - staging
  only:
    refs:
      - branches
    variables:
      - $CI_COMMIT_REF_NAME == "test-new-runners"

In staging-new.yml I extend both templates to create a job definition:

'Build Image (Staging New)':
  extends:
    - .build-image
    - .staging-new

The problem is, this job definition does not get all tags defined in all templates it extends, but only the tags from the last template in the list.

I tried to do this:

'Build Image (Staging New)':
  extends:
    - .build-image
    - .staging-new
  tags:
    - !reference [.build-image, tags]
    - !reference [.staging-new, tags]

But I get this error: This GitLab CI configuration is invalid: jobs:build image (staging new):tags config should be an array of strings.

If I look into the full configuration in the pipeline editor I see this:

Build Image (Staging New):
  stage: Build
  tags:
  - - "$RUNNER_XLARGE"
  - - staging
  script:
  - scripts/build_image.sh
  variables:
    RUNNER_SMALL: worker-xsmall
    RUNNER_XLARGE: worker-medium
    RUNNER_4XLARGE: worker-large
  only:
    refs:
    - branches
    variables:
    - $CI_COMMIT_REF_NAME == "test-new-runners"
  extends:
  - ".build-image"
  - ".staging-new"

If I remove the dashes in front of !reference then it fails harder (I can’t even generate the full configuration).

Our repos are hosted on gitlab.com but our runners are self-built, running in AWS.

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