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dynamic runner tag

Variable expansion in tags works.

Simple runner tag can be set as shown: 

variables:
  RUNNER_TAG: "staging"
job:
  tags:
    - $RUNNER_TAG  
tags:
  - ${CI_COMMIT_BRANCH}

Not possible to define array of strings as variable: 

variables:
  RUNNER_TAG: [ "staging", "test" ]   # LINT ERROR
job:
  tags: $RUNNER_TAGS

How to set a dynamic gitlab job tag with a variable?

run pipeline on the same runner

During CI job execution env contains very usefull variable: 

CI_RUNNER_TAGS=["linux", "docker", "small", "medium"]

and this variable can be used to generate yaml file for new dynamically generated child pipeline.