Add support for travis-ci to build releases, as well as a script to tag code for which a release should be built

Author: ralimi

.travis.yml

@@ -1,3 +1,11 @@
 language: go
 go:
-  - 1.x
+- 1.x
+deploy:
+  provider: releases
+  api_key:
+    secure: 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
+  file: bin/chrome-ssh-agent.zip
+  skip_cleanup: true
+  on:
+    tags: true

release.sh

@@ -0,0 +1,53 @@
+#!/bin/bash -eu
+#
+# Copyright 2018 Google LLC
+#
+# 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.
+
+# Usage:
+#  (1) Update version in manifest.json
+#  (2) Run release.sh
+
+cd $(dirname $0)
+
+function die() {
+  echo $1
+  exit 1
+}
+
+# Read current version from manifest.
+readonly MANIFEST=${PWD}/manifest.json
+readonly VERSION=$(cat "${MANIFEST}" | python -c "import sys, json; print json.load(sys.stdin)['version']")
+readonly TAG=v${VERSION}
+
+# Ensure the tag doesn't already exist.  This could happen if someone forgot to
+# update the version in manifest.json.
+test -z $(git tag | grep --line-regexp "${TAG}") \
+  || die "Version ${VERSION} already exists"
+
+# Update all vendor packages and ensure everything still builds
+# and tests pass.
+govendor fetch +vendor
+make
+
+# Commit everything. This should include the change to manifest.json and any
+# updated vendored packages.
+git add .
+git commit -m "Bump to version ${VERSION}"
+
+# Tag the release.
+git tag -a "${TAG}" -m "Tag version ${VERSION}"
+
+# Push to remote repository, both changes and tags.
+git push
+git push --tags