Adding CI setup files

.ci/Jenkinsfile

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+#!/usr/bin/env groovy
+
+@Library('apm@current') _
+
+pipeline {
+  agent { label 'ubuntu-18 && immutable' }
+  environment {
+    BASE_DIR="src/github.com/elastic/package-spec"
+    JOB_GIT_CREDENTIALS = "f6c7695a-671e-4f4f-a331-acdce44ff9ba"
+    PIPELINE_LOG_LEVEL='INFO'
+  }
+  options {
+    timeout(time: 15, unit: 'MINUTES')
+    buildDiscarder(logRotator(numToKeepStr: '20', artifactNumToKeepStr: '20', daysToKeepStr: '30'))
+    timestamps()
+    ansiColor('xterm')
+    disableResume()
+    durabilityHint('PERFORMANCE_OPTIMIZED')
+    rateLimitBuilds(throttle: [count: 60, durationName: 'hour', userBoost: true])
+    quietPeriod(10)
+  }
+  triggers {
+    issueCommentTrigger('(?i)(.*(?:jenkins\\W+)?run\\W+(?:the\\W+)?tests(?:\\W+please)?.*|^\\/test$)')
+  }
+  stages {
+    /**
+     Checkout the code and stash it, to use it on other stages.
+     */
+    stage('Checkout') {
+      steps {
+        deleteDir()
+        gitCheckout(basedir: "${BASE_DIR}")
+        stash allowEmpty: true, name: 'source', useDefaultExcludes: false
+      }
+    }
+    /**
+     Check the source code.
+     */
+    stage('Check') {
+      steps {
+        cleanup()
+        withMageEnv(){
+          dir("${BASE_DIR}"){
+            sh(label: 'Check',script: 'make check')
+          }
+        }
+      }
+    }
+    /**
+     Test the source code.
+     */
+    stage('Test') {
+      steps {
+        cleanup()
+        withMageEnv(){
+          dir("${BASE_DIR}"){
+            sh(label: 'Check',script: 'make test')
+          }
+        }
+      }
+    }
+  }
+  post {
+    cleanup {
+      notifyBuildResult(prComment: true)
+    }
+  }
+}
+
+def cleanup(){
+  dir("${BASE_DIR}"){
+    deleteDir()
+  }
+  unstash 'source'
+}

.ci/jobs/defaults.yml

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+---
+
+##### GLOBAL METADATA
+
+- meta:
+    cluster: beats-ci
+
+##### JOB DEFAULTS
+
+- job:
+    logrotate:
+      numToKeep: 20
+    node: linux
+    concurrent: true
+    publishers:
+      - email:
+          recipients: [email protected]
+    prune-dead-branches: true

.ci/jobs/package-spec.yml

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+---
+- job:
+    name: Beats/package-spec
+    display-name: Package Spec
+    description: Jenkins pipeline for the Package Spec project
+    view: Beats
+    project-type: multibranch
+    script-path: .ci/Jenkinsfile
+    scm:
+      - github:
+          branch-discovery: no-pr
+          discover-pr-forks-strategy: merge-current
+          discover-pr-forks-trust: permission
+          discover-pr-origin: merge-current
+          discover-tags: true
+          notification-context: 'package-spec'
+          repo: package-spec
+          repo-owner: elastic
+          credentials-id: 2a9602aa-ab9f-4e52-baf3-b71ca88469c7-UserAndToken
+          ssh-checkout:
+            credentials: f6c7695a-671e-4f4f-a331-acdce44ff9ba
+          build-strategies:
+            - tags:
+                ignore-tags-older-than: -1
+                ignore-tags-newer-than: -1
+            - regular-branches: true
+            - change-request:
+                ignore-target-only-changes: false
+          clean:
+            after: true
+            before: true
+          prune: true
+          shallow-clone: true
+          depth: 5
+          do-not-fetch-tags: true
+          submodule:
+            disable: false
+            recursive: true
+            parent-credentials: true
+            timeout: 100
+          timeout: '15'
+          use-author: true
+          wipe-workspace: true