Update to circle 2.0

Author: jrconlin

.circleci/config.yml

@@ -0,0 +1,88 @@
+# These environment variables must be set in CircleCI UI
+#
+# DOCKERHUB_REPO - docker hub repo, format: <username>/<repo>
+# DOCKER_USER    - login info for docker hub
+# DOCKER_PASS
+#
+version: 2
+jobs:
+  build:
+    docker:
+      - image: docker:18.02.0-ce
+    working_directory: /dockerflow
+    steps:
+      # workaround circleci's fallback git's "object not found" error w/ tag
+      # builds
+      - run:
+          name: Install Docker build dependencies
+          command: apk add --no-cache openssh-client git
+
+      - checkout
+      - setup_remote_docker
+
+      - run:
+          name: Build Docker image
+          command: docker build -t app:build .
+
+      # save the built docker container into CircleCI's cache. This is
+      # required since Workflows do not have the same remote docker instance.
+      - run:
+          name: docker save app:build
+          command: mkdir -p /cache; docker save -o /cache/docker.tar "app:build"
+      - save_cache:
+          key: v1-{{ .Branch }}-{{ .Environment.CIRCLE_TAG }}-{{ epoch }}
+          paths:
+            - /cache/docker.tar
+
+  deploy:
+    docker:
+      - image: docker:18.02.0-ce
+    steps:
+      - setup_remote_docker
+      - restore_cache:
+          key: v1-{{.Branch}}
+      - run:
+          name: Restore Docker image cache
+          command: docker load -i /cache/docker.tar
+
+      - run:
+          name: Deploy to Dockerhub
+          command: |
+            if [ "${CIRCLE_BRANCH}" == "master" ]; then
+              DOCKER_TAG="latest"
+            fi
+
+            if echo "${CIRCLE_BRANCH}" | grep '^feature\..*' > /dev/null; then
+              DOCKER_TAG="${CIRCLE_BRANCH}"
+            fi
+
+            if [ -n "${CIRCLE_TAG}" ]; then
+              DOCKER_TAG="$CIRCLE_TAG"
+            fi
+
+            if [ -n "${DOCKER_TAG}" ]; then
+              echo "$DOCKER_PASS" | docker login -u "$DOCKER_USER" --password-stdin
+              echo ${DOCKERHUB_REPO}:${DOCKER_TAG}
+              docker tag app:build ${DOCKERHUB_REPO}:${DOCKER_TAG}
+              docker images
+              docker push "${DOCKERHUB_REPO}:${DOCKER_TAG}"
+            else
+              echo "Not pushing to dockerhub for tag=${CIRCLE_TAG} branch=${CIRCLE_BRANCH}"
+            fi
+
+workflows:
+  version: 2
+  build-deploy:
+    jobs:
+      - build:
+          filters:
+            tags:
+              only: /.*/
+
+      - deploy:
+          requires:
+            - build
+          filters:
+            tags:
+              only: /.*/
+