adds circleci config

Author: Sameer Naik

.circleci/config.yml

@@ -0,0 +1,70 @@
+version: 2.1
+
+orbs:
+  go: circleci/go@1
+  gcp-cli: circleci/gcp-cli@1
+
+jobs:
+  build:
+    executor:
+      name: gcp-cli/default
+    steps:
+      - checkout
+      - gcp-cli/install
+      - gcp-cli/initialize
+      - run:
+          name: Building docker image
+          command: make -j6 cloudbuild-test
+
+  publish-image:
+    executor:
+      name: gcp-cli/google
+    steps:
+      - checkout
+      - gcp-cli/initialize
+      - run:
+          name: Publishing docker image
+          command: IMAGE_SHA=${CIRCLE_SHA1} IMAGE_TAG=${CIRCLE_TAG:-latest} make -j6 cloudbuild
+
+  release:
+    executor:
+      name: go/default
+      tag: '1.15'
+    steps:
+      - checkout
+      - run:
+          name: Installing github-release tool
+          command: go get github.com/meterup/github-release
+      - run:
+          name: Creating github release
+          command: |
+            PRE_RELEASE=${CIRCLE_TAG/${CIRCLE_TAG%-rc[0-9]*}/}
+            github-release delete -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} -t ${CIRCLE_TAG} 2>/dev/null ||:
+            ./scripts/release-notes.sh ${CIRCLE_TAG} | github-release release ${PRE_RELEASE:+-p} -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} -t ${CIRCLE_TAG} -d -
+
+workflows:
+  build-test-and-publish:
+    jobs:
+      - build:
+          context: production
+          filters:
+            tags:
+              only: /^v([0-9]+)\.([0-9]+)\.([0-9]+)(?:-([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?(?:\+[0-9A-Za-z-]+)?$/
+      - publish-image:
+          context: production
+          requires:
+            - build
+          filters:
+            tags:
+              only: /^v([0-9]+)\.([0-9]+)\.([0-9]+)(?:-([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?(?:\+[0-9A-Za-z-]+)?$/
+            branches:
+              only: master
+      - release:
+          context: production
+          requires:
+            - publish-image
+          filters:
+            tags:
+              only: /^v([0-9]+)\.([0-9]+)\.([0-9]+)(?:-([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?(?:\+[0-9A-Za-z-]+)?$/
+            branches:
+              ignore: /.*/