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Maven / GitHub Actions Interview Questions

What is GitHub Actions and what problems does it solve?

GitHub Actions is a native CI/CD and workflow-automation platform built directly into GitHub. Instead of connecting an external tool such as Jenkins or CircleCI, you define automation logic in YAML files stored alongside your code. GitHub executes those files on cloud-hosted (or your own self-hosted) machines whenever events you choose — like a push or a pull request — occur in your repository.

Before GitHub Actions, teams had to manage a separate CI server, configure webhooks between that server and GitHub, and maintain credentials in two places. GitHub Actions eliminates that operational overhead: authentication happens automatically through the built-in GITHUB_TOKEN, secrets live in the same GitHub repository settings, and run history is visible right on the pull request page.

The platform solves several concrete problems:

  • Automated testing: Run your test suite on every push or pull request without manually triggering a job.
  • Continuous deployment: Build a container image, push it to a registry, and deploy to Kubernetes or a cloud service in a single chained workflow.
  • Repository maintenance: Automatically label issues, close stale pull requests, or publish release notes when a tag is pushed.
  • Cross-platform builds: Use a matrix strategy to compile or test on Linux, macOS, and Windows simultaneously.

Pricing-wise, GitHub Actions is free for public repositories and includes a generous free tier for private ones. Minutes beyond the free tier are billed per minute, varying by runner type.

Which file format does GitHub Actions use to define workflow automation?
Which built-in token does GitHub Actions automatically provide to authenticate within a workflow run?

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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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