move circleci config to 2.0

.circleci/config.yml

@@ -0,0 +1,18 @@
+version: 2
+jobs:
+  build:
+    working_directory: ~/build
+    docker:
+      - image: circleci/golang:latest
+    steps:
+      - checkout
+      - setup_remote_docker:
+          version: 17.05.0-ce
+      - run: make image
+      - deploy: |
+          if [[ "$CIRCLE_BRANCH" == "master" ]]; then
+            docker tag ctop quay.io/vektorlab/ctop:latest
+            docker tag ctop quay.io/vektorlab/ctop:$(cat VERSION)
+            docker login -e $DOCKER_EMAIL -u $DOCKER_USER -p $DOCKER_PASS quay.io
+            docker push quay.io/vektorlab/ctop
+          fi