add jenkins

Jenkinsfile

@@ -0,0 +1,23 @@
+pipeline {
+    agent any
+
+    environment {
+        VERSION = VersionNumber([
+            versionNumberString:
+                '${BUILDS_ALL_TIME}',
+            versionPrefix: '1.0.',
+            worstResultForIncrement: 'SUCCESS'
+        ])
+    }
+
+    stages {
+        stage('Building') {
+            steps {
+                script {
+                    currentBuild.displayName = env.VERSION
+                }
+                sh 'yarn ci ${VERSION}'
+            }
+        }
+    }
+}

jenkins.js

@@ -0,0 +1,26 @@
+/* eslint-disable no-process-exit */
+/* eslint-disable no-console */
+/* eslint-disable no-sync */
+'use strict';
+
+const fs = require ('fs');
+const child_process = require ('child_process');
+
+const pkg = JSON.parse (fs.readFileSync ('package.json', 'utf-8'));
+[
+  ,, pkg.version
+] = process.argv;
+fs.writeFileSync ('package.json', JSON.stringify (pkg, null, 2));
+
+child_process.execSync ('yarn lint', { stdio: 'inherit' });
+if (typeof pkg.scripts !== 'undefined' && typeof pkg.scripts.test === 'string')
+  child_process.execSync ('yarn test', { stdio: 'inherit' });
+
+child_process.exec ('git log -1 | grep \'\\[no publish\\]\'')
+  .addListener ('exit', (code) => {
+    if (code === 0) {
+      console.log ('build not marked for deployment');
+      process.exit (1);
+    }
+    else { child_process.execSync ('yarn publish'); }
+  });