Enables Circle CI job that uses the cl lint tool on changed charts (#143)

.circleci/chart-testing.yaml

@@ -0,0 +1,2 @@
+chart-repos:
+  - argo=https://argoproj.github.io/argo-helm

.circleci/config.yml

@@ -0,0 +1,35 @@
+version: 2.1
+jobs:
+  lint:
+    docker:
+      - image: gcr.io/kubernetes-charts-ci/test-image:v3.0.1
+    steps:
+      - checkout
+      - run: ct lint --config .circleci/chart-testing.yaml
+  # Technically this only needs to be run on master, but it's good to have it run on every PR
+  # so that it is regularly tested.
+  publish:
+    docker:
+      # We just need an image with `helm` on it. Handily we know of one already.
+      - image: gcr.io/kubernetes-charts-ci/test-image:v3.0.1
+    steps:
+      # install the additional keys needed to push to Github. Alex Collins owns these keys.
+      - add_ssh_keys
+      - run: git config --global user.email "nobody@circleci.com"
+      - run: git config --global user.name "Circle CI Build"
+      - checkout
+      - run: helm init --client-only
+      # Only actually publish charts on master.
+      - run: |
+          if [ "$CIRCLE_BRANCH" = "master" ]; then
+           echo 'export GIT_PUSH=true' >> $BASH_ENV 
+          fi
+      - run: sh ./scripts/publish.sh
+workflows:
+  version: 2
+  workflow:
+    jobs:
+      - lint
+      - publish:
+          requires:
+            - lint