Add CI Pipeline Using GitHub Actions

[Dejmenek]

Overview

Set up a Continuous Integration (CI) pipeline for the TournamentAPI repository utilizing GitHub Actions.

Tasks

• Create a workflow file (e.g., .github/workflows/ci.yml) to automate builds and tests
• Ensure the pipeline runs on every push and pull request to main branches
• Integrate steps to restore dependencies, build the application, and run integration tests.

Expected Outcome

• PRs and pushes are automatically validated via the CI pipeline
• Workflows are visible under the repository's 'Actions' tab