Jenkinsfile: Add boot image to the list of artifacts

Jenkinsfile

@@ -4,6 +4,7 @@ node {
    artifacts = "checksums,${params.board}.img.xz,tmp/*-report.log,files/meta.yml"
    build_on_x86 = [ 'imx6', 'qemu-x86_64' ]
    qcow2_builds = [ 'qemu-x86_64' ]
+   separate_boot_image = []
    currentBuild.description = "${params.board} ${params.dist} ${build_type} image"
 
    parameters {
@@ -23,6 +24,10 @@ node {
      artifacts += ",${params.board}.qcow2"
    }
 
+   if (separate_boot_image.contains(params.board)) {
+     artifacts += ",${params.board}-boot.img.xz"
+   }
+
    node (nodename) {
      stage('Setup') {
         git url: gitUrl, branch: branch