For CI/CD of your projects, you can use Jenkins. To set up a workflow, you can create a pipeline. They are written in Pipeline DSL based on Groovy syntax. The best practice is to keep the pipeline in a file in the repository and not as a script in Jenkins. The file containing the pipeline is called a Jenkinsfile.
Example (Declarative Pipeline)
pipeline {
agent any
stages {
stage('Build') {
steps {
echo 'Building...'
}
}
stage('Test') {
steps {
echo 'Testing...'
}
}
stage('Deploy') {
steps {
echo 'Deploying...'
}
}
}
}