feat: Send the workload user's email with the start flow request

What does this MR do and why?

This MR adds the StartWorkflowRequest's workload_user 's (the user triggering the workflow or the service account, if enabled) email address to the request as an ENV variable. The priority for which email to use is commit email > email > static default email.

References

gitlab-org/modelops/applied-ml/code-suggestions/ai-assist#1487 (closed)

gitlab-org/duo-workflow/duo-workflow-executor!239 (merged)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Enable the composite identity FF

Feature.enable(:duo_workflow_use_composite_identity)

2. Add this file to the repository at .gitlab/duo/agent-config.yml

setup_script:
  - echo "$DUO_WORKFLOW_GIT_USER_EMAIL".  # To verify the email address
  - exit 0                                # To skip the actual workflow execution

3. Start a new workflow

curl --location 'http://gdk.test:3000/api/v4/ai/duo_workflows/workflows' \
 --header 'Content-Type: application/json' \
 --header 'PRIVATE-TOKEN: $TOKEN' \
 --data '{
     "project_id": "1000000",
     "goal": "JenkinsFile",
     "workflow_definition": "convert_to_gitlab_ci",
     "start_workflow": true
 }'

4. Verify that the service accounts email is present

   

5. Disable the composite identity FF

Feature.disable(:duo_workflow_use_composite_identity)

6. Repeat step 3, this time, the user's email address will be there

   

7. Change the user's commit email (preferences -> profile -> main settings) and verify that it changes in the output as well

   

MR acceptance checklist

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Related to gitlab-org/modelops/applied-ml/code-suggestions/ai-assist#1487 (closed)