Add initial Jenkinsfile

Jenkinsfile

@@ -0,0 +1,22 @@
+pipeline {
+  agent {
+    docker {
+      image 'gradle:jdk8-slim'
+    }
+
+  }
+  stages {
+    stage('Build') {
+      steps {
+        sh './gradlew shadowJar'
+        archiveArtifacts 'build/libs/*.jar'
+      }
+    }
+    stage('Test') {
+      steps {
+        sh './gradlew test'
+        junit 'build/test-results/test/*.xml'
+      }
+    }
+  }
+}