[Jenkins] Jenkins Shared Library example usage from scripted pipeline

jenkins_lib_example.groovy

#!/usr/bin/env groovy
@Library('devopslib')

import org.jenkinsci.plugins.workflow.steps.FlowInterruptedException
import spv.devops.*

// Create shared library instance with jenkins `steps` object
def utils = new Utils(this)

node {
    try {
        stage("Notify started build") {
            withCredentials([string(credentialsId: <token_id>, variable: 'TOKEN')]) {
                // Using function from shared library
                utils.sendToTelegram(TOKEN, env.NOTIFY_CHAT_ID, "Build started" as String)
            }
        }
        stage("Git checkout") {
            git branch: 'master',
                credentialsId: <token_id>,
                url: <url>
        }
        stage("Docker Build") {
            sh "docker build --file .deploy/Dockerfile ."
        }
    }
    catch (FlowInterruptedException exc) {
        currentBuild.result = 'ABORTED'
    }
    catch (Exception exc) {
        println "Failed"
        println(exc as String)
        currentBuild.result = 'FAILURE'
    }
    finally {
        cleanWs()
        withCredentials([string(credentialsId: <token_id>, variable: 'TOKEN')]) {
            utils.sendToTelegram(TOKEN, env.NOTIFY_CHAT_ID, "Build finished" as String)
        }
    }
}