add CI/CD

.circleci/config.yml

@@ -0,0 +1,37 @@
+version: 2.1
+jobs:
+
+  build-python3:
+    docker:
+      - image: ocrd/core
+    environment:
+      PIP: pip3
+      PYTHON: python3
+    steps:
+      - checkout
+      - run: make install
+
+  deploy-docker:
+    docker:
+      - image: circleci/buildpack-deps:stretch
+    steps:
+      - checkout
+      - setup_remote_docker: # https://circleci.com/docs/2.0/building-docker-images/
+          docker_layer_caching: true
+      - run: make docker
+      - run:
+          name: Login to Docker Hub
+          command: echo "$DOCKERHUB_PASS" | docker login --username "$DOCKERHUB_USER" --password-stdin
+      - run: docker push ocrd/segment
+
+workflows:
+  version: 2
+  build-and-test:
+    jobs:
+      - build-python3
+  deploy:
+    jobs:
+      - deploy-docker:
+          filters:
+            branches:
+              only: master