use ci repo as shared jenkins library

Jenkinsfile

@@ -1,22 +1,3 @@
 #!/bin/env groovy
-
-def clone (repo_url, git_ref = "master") {
-    checkout(
-        poll: false,
-        scm: [
-            $class: 'GitSCM',
-            branches: [[name: git_ref]],
-            extensions: [[$class: 'CleanBeforeCheckout']],
-            userRemoteConfigs: [[url: repo_url]]
-        ]
-    )
-}
-
-def pipeline
-node {
-    dir('dlang/ci') {
-        clone 'https://github.com/dlang/ci.git', 'master'
-    }
-    pipeline = load 'dlang/ci/pipeline.groovy'
-}
-pipeline.runPipeline()
+library 'dlang'
+runPipeline()