Introduction

GitHub Actions is one of the most popular CI/CD tools today. This guide covers everything from basics to advanced techniques.

Basic Workflow Structure

name : CI/CD Pipeline

on : push : branches : [ main , develop ] pull_request : branches : [ main ]

jobs : test : runs-on : ubuntu-latest steps : - uses : actions/checkout@v4 - uses : actions/setup-node@v4 with : node-version : ' 18' - run : npm ci - run : npm test

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Matrix Builds

Test across multiple environments:

strategy : matrix : node-version : [ 16 , 18 , 20 ] os : [ ubuntu-latest , windows-latest ]

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Caching

Speed up builds with caching:

- uses : actions/setup-node@v4 with : node-version : ' 18' cache : ' npm'

- uses : actions/cache@v3 with : path : ~/.cache/pip key : ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}

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Reusable Workflows

Create reusable workflow:

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