Enable build validation with Jenkins

Add Jenkinsfile for enabling the validation of every
incoming change against its build and tests.

This is to prevent future breakages due to untested
changes merged and not validated.

Change-Id: Ie2cc781cc39d27cdb8c061830a343381ca13e8a5

Jenkinsfile

diff --git a/Jenkinsfile b/Jenkinsfile
new file mode 100644
index 0000000..0e788e8
--- /dev/null
+++ b/Jenkinsfile
@@ -0,0 +1,2 @@
+pluginPipeline(formatCheckId: 'gerritforge:git-repo-metrics-format-dcf840cc5047dd58175ddbe23ab81198c837f353',
+               buildCheckId: 'gerritforge:git-repo-metrics-dcf840cc5047dd58175ddbe23ab81198c837f353')