Add the main Jenkins build script to git.

hack/jenkins/cross_build.sh

+#!/bin/bash
+
+# Copyright 2016 The Kubernetes Authors All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# The script expects the following env variabls:
+# ghprbPullId: The pull request ID, injected from the ghpbr plugin.
+# ghprbActualCommit: The commit hash, injected from the ghpbr plugin.
+
+gsutil cp gs://minikube-builds/logs/index.html gs://minikube-builds/logs/${ghprbPullId}/index.html
+
+# Build all platforms (Windows, Linux, OSX)
+make cross
+
+# Build the e2e test target for Darwin and Linux. We don't run tests on Windows yet.
+# We build these on Linux, but run the tests on different platforms.
+# This makes it easier to provision slaves, since they don't need to have a go toolchain.'
+GOPATH=$(pwd)/_gopath GOOS=darwin GOARCH=amd64 go test -c k8s.io/minikube/test/integration --tags=integration -o out/e2e-darwin-amd64
+GOPATH=$(pwd)/_gopath GOOS=linux GOARCH=amd64 go test -c k8s.io/minikube/test/integration --tags=integration -o out/e2e-linux-amd64
+cp -r test/integration/testdata out/
+
+# Upload everything we built to Cloud Storage.
+gsutil -m cp -r out/* gs://minikube-builds/${ghprbPullId}/