Run tests with multiple cores in CI

Author: MarkEWaite

Jenkinsfile

@@ -1,5 +1,16 @@
-// Builds a module using https://github.com/jenkins-infra/pipeline-library
-buildPlugin(useContainerAgent: true, configurations: [
-    [platform: 'linux', jdk: 17],
-    [platform: 'windows', jdk: 11, jenkins: '2.407'],
-])
+#!/usr/bin/env groovy
+
+/* `buildPlugin` step provided by: https://github.com/jenkins-infra/pipeline-library */
+buildPlugin(
+  // Run a JVM per core in tests
+  forkCount: '1C',
+  // Container agents start faster and are easier to administer
+  useContainerAgent: true,
+  // Show failures on all configurations
+  failFast: false,
+  // Test Java 11 and Java 17
+  configurations: [
+    [platform: 'linux',   jdk: '17'], // Linux first for coverage report on ci.jenkins.io
+    [platform: 'windows', jdk: '11'],
+  ]
+)