AZ-400 Practice Question: Design and implement build and release pipelines
Your organization uses GitHub Actions. You need to create a reusable workflow that builds and tests a Node.js application. Which approach should you use to define the workflow?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Define a reusable workflow with 'on: workflow_call'
Reusable workflows are defined in a separate file with workflow_call trigger. Option A is wrong because it defines a workflow that cannot be reused. Option B is wrong because actions are different from workflows. Option C is wrong because composite actions are for multiple steps, not entire workflows.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Define a standard workflow in .github/workflows/build.yml
Why it's wrong here
A standard workflow in .github/workflows/build.yml is triggered by repository events (e.g., push, pull_request) and cannot be invoked from another workflow; to be reusable it must explicitly define the workflow_call trigger, otherwise GitHub Actions treats it as a standalone event-driven workflow.
- ✗
Use a composite action to encapsulate the build steps
Why it's wrong here
A composite action encapsulates multiple run/uses steps into a single step, but it is still just an action, not a workflow—it lacks its own triggers, job-level settings, and cannot be called as a top-level workflow from another repository; it is meant for grouping reusable step logic, not orchestrating jobs.
- ✗
Create a custom action and reference it in multiple workflows
Why it's wrong here
A custom action is a reusable building block referenced via uses: in a step, but a single action is not a complete workflow and cannot define jobs, runners, or the workflow-level trigger (workflow_call); it is intended to be composed inside workflows, not to replace the workflow itself.
- ✓
Define a reusable workflow with 'on: workflow_call'
Why this is correct
Defining a reusable workflow with on: workflow_call is correct because it makes the workflow callable from other workflows using the uses: syntax (e.g., uses: ./.github/workflows/build.yml), allowing you to create a standard build pipeline that can be referenced by many workflows without duplicating job definitions.
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