Add Helm release to staging

Signed-off-by: Maartje Eyskens <maartje@eyskens.me>

Author: meyskens

.helm_staging.yml

@@ -0,0 +1,5 @@
+app:
+  dataServiceUrl: ipv4://lookout:10301
+
+nodeSelector:
+  srcd.host/app: lookout

.travis.yml

@@ -53,3 +53,9 @@ jobs:
       script:
         - PKG_OS=linux make packages
         - DOCKER_PUSH_LATEST=true make docker-push
+    - name: 'Deploy to staging'
+      stage: release
+      install:
+        - make install-helm
+      script:
+        - HELM_RELEASE=lookout-gometalint-analyzer HELM_CHART=src-d/lookout-gometalint-analyzer K8S_NAMESPACE=lookout HELM_ARGS="--tiller-namespace=lookout --repo https://src-d.github.io/charts/index.yaml --set image.tag=$TRAVIS_TAG -f .helm_staging.yml" make deploy