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Maven / GitHub Actions Interview Questions

What are workflow triggers (on:) and which event types does GitHub Actions support?

The on: key defines which GitHub events cause a workflow to run. You can listen to a single event, a list of events, or an event with filters. GitHub provides more than 35 distinct event types across three broad categories.

Repository events fire when something happens in your repo:

  • push — a commit or tag is pushed
  • pull_request — a PR is opened, synchronised, closed, etc.
  • pull_request_target — same as above but runs in the context of the base branch (useful for forks)
  • release — a release is published, edited, or deleted
  • issues, issue_comment, discussion
  • create, delete — branch or tag creation/deletion

Scheduled triggers use cron syntax:

on:
  schedule:
    - cron: '0 6 * * 1'   # Every Monday at 06:00 UTC

Manual and cross-workflow triggers:

  • workflow_dispatch — lets you run the workflow manually from the GitHub UI or API, with optional input parameters
  • workflow_call — makes the workflow callable from another workflow (reusable workflows)
  • workflow_run — triggers when another named workflow completes
  • repository_dispatch — triggers via a custom HTTP POST to the GitHub API, useful for external systems

Most event types accept additional filters. For example, push accepts branches:, tags:, and paths: filters so you only trigger on relevant changes instead of every push to every branch.

Which trigger allows you to manually start a GitHub Actions workflow from the GitHub UI?
Which on: event uses a cron expression to schedule a workflow on a time basis?

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More Related questions...

What is GitHub Actions and what problems does it solve? What are the key components of GitHub Actions — workflows, jobs, steps, actions, and runners? How is a GitHub Actions workflow file structured, and where must it be placed? What are workflow triggers (on:) and which event types does GitHub Actions support? What is the difference between push, pull_request, and workflow_dispatch triggers? What are jobs in GitHub Actions, and how do they run in parallel by default? What are steps, and what is the difference between run: and uses: in a step? What are runners, and what is the difference between GitHub-hosted and self-hosted runners? What is the GitHub Actions Marketplace and how do you find and use actions from it? How do you use the actions/checkout action and what does it do? How do you pass environment variables and secrets to a GitHub Actions workflow? What is the difference between the env:, secrets:, and vars: contexts in GitHub Actions? How do you cache dependencies in GitHub Actions using actions/cache? How do you use matrix builds in GitHub Actions to test across multiple environments? How do you control job execution order in GitHub Actions using needs:? How do you share data between steps within a job using step outputs? How do you share build artifacts between jobs using actions/upload-artifact and actions/download-artifact? What are reusable workflows in GitHub Actions and how do you call them? What are composite actions and when should you choose them over reusable workflows? How do you set up a Docker container service for integration tests using services: in GitHub Actions? How do you use conditional steps with if: in GitHub Actions? What are the key GitHub Actions expression contexts and what information does each provide? How do you use concurrency groups to cancel outdated workflow runs in GitHub Actions? What is the GITHUB_TOKEN and what permissions does it have? How do you trigger one GitHub Actions workflow from another using workflow_run? How do you write a custom JavaScript action for GitHub Actions? How do you write a custom Docker container action for GitHub Actions? How do you implement a complete CI/CD pipeline for a container image in GitHub Actions — build, push to a registry, and deploy? How do you implement path filtering so a workflow only runs when specific files change? How do you debug failing GitHub Actions workflows — enabling debug logging and using tmate? How do you implement branch protection rules with required GitHub Actions status checks? How do you handle large monorepos with multiple services in GitHub Actions? What are OpenID Connect (OIDC) tokens in GitHub Actions and how do they replace long-lived cloud credentials? How do you prevent secret exposure and follow security hardening best practices in GitHub Actions? What are the key differences between GitHub Actions, Jenkins, and GitLab CI?
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