Use pre-commit on CI

.pre-commit-config.yaml

@@ -0,0 +1,6 @@
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.1.0
+    hooks:
+    -   id: end-of-file-fixer
+    -   id: trailing-whitespace

Jenkinsfile

@@ -1 +1,10 @@
+node('linux') {
+    stage('pre-commit') {
+            infra.checkout()
+            sh '''#!/bin/sh -eux
+               curl https://pre-commit.com/install-local.py | python -
+               "$HOME/bin/pre-commit" run --all-files
+           '''
+    }
+}
 buildPlugin()