Support variable expansion in services:variables: keyword

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Summary

Variables are not propagated from Project-level definitions to CI Services

Steps to reproduce

• Define a variable in a Gitlab project via the UI
• Make a .gitlab-ci.yml file that starts a service that references that variable (I used docker:dind and DOCKER_TLS_CERTDIR)
• See that the service doesn't get the variable value from the project
• As a workaround, define the variable in the service definition, eg:

default:
  services:
    - name: docker:25.0.2-dind
      variables:
        DOCKER_TLS_CERTDIR: $DOCKER_TLS_CERTDIR

• Now see that the service is provided the variable.

What is the current bug behavior?

Project variables are not passed to CI services.

What is the expected correct behavior?

Project variables are passed to CI services.

Output of checks

This bug happens on GitLab.com