Add missing release job to circleci (#62)

Author: f-moya

.circleci/config.yml

@@ -13,6 +13,42 @@ jobs:
       - run:
           name: Test
           command: make test
+
+  release_images:
+    machine:
+      docker_layer_caching: true
+    working_directory: ~/codeclimate/codeclimate-sonar-java
+    steps:
+      - checkout
+      - run:
+          name: Validate owner
+          command: |
+            if [ "$CIRCLE_PROJECT_USERNAME" -ne "codeclimate" ]
+            then
+              echo "Skipping release for non-codeclimate branches"
+              circleci step halt
+            fi
+      - run: make image
+      - run: echo "$GCR_JSON_KEY" | docker login -u _json_key --password-stdin us.gcr.io
+      - run:
+          name: Push image to GCR
+          command: |
+            docker tag codeclimate/codeclimate-sonar-java \
+              us.gcr.io/code-climate/codeclimate-sonar-java:b$CIRCLE_BUILD_NUM
+            docker push us.gcr.io/code-climate/codeclimate-sonar-java:b$CIRCLE_BUILD_NUM
+
+workflows:
+  version: 2
+  build_deploy:
+    jobs:
+      - build
+      - release_images:
+          requires:
+            - build
+          filters:
+            branches:
+              only: /master|channel\/[\w-]+/
+
 notify:
   webhooks:
     - url: https://cc-slack-proxy.herokuapp.com/circle