Jenkins

Jenkins is one of the many CI tools to automate deploying your code. Jenkins allows for a declarative language written in a file in the Git repository.

Jenkinsfile

Here is a basic example of a declarative pipeline that would live in a Jenkinsfile:

pipeline {
    agent any
    stages {
        stage('first stage') {
            steps {
                echo 'Step 1'
            }
        }
    }
}

In the preceding code, we first define which agent the work will be done on – for our use case, we will use any agent. In other cases, you might have work organized by teams, production, or other possible choices...