Continuous integration and deployment for a Clojure project on Gitlab

Dockerfile

# Note, this dockerfile only works if you move the .jar
# file into the project directory first. This was done
# to get a clean, without any paths, artifact on Gitlab

FROM openjdk:8-jre-alpine
RUN mkdir -p /app /app/resources
WORKDIR /app
COPY *-standalone.jar .
COPY resources/pegasus/public .
CMD java -jar pegasus-0.1.0-SNAPSHOT-standalone.jar
EXPOSE 3000

gitlab-ci-clojure.yaml

image: "docker:latest"
services:
  - docker:dind

variables:
  BUILD_IMAGE: clojure:lein-2.8.1-alpine
  CONTAINER_BASE_NAME: registry.wunki.org/wunki/pegasus
  CONTAINER_TEST_IMAGE: $CONTAINER_BASE_NAME:$CI_BUILD_REF_SLUG
  CONTAINER_RELEASE_IMAGE: $CONTAINER_BASE_NAME:latest

  # For caching, we need to move the .m2 directory
  # into the project directory.
  LEIN_JVM_OPTS: -Duser.home=$CI_PROJECT_DIR

stages:
  - test
  - build
  - image
  - deploy

test:lein:
  stage: test
  image: $BUILD_IMAGE
  script:
    - lein test
  cache:
    paths:
      - .m2
  tags:
    - docker

build:uberjar:
  stage: build
  image: $BUILD_IMAGE
  script:
    - lein uberjar
    # copy the artifact to the project directory so
    # we don't have the directory name in the zip
    - mv target/pegasus-0.1.0-SNAPSHOT-standalone.jar $CI_PROJECT_DIR
  cache:
    paths:
      - .m2
  artifacts:
    name: "pegasus_${CI_BUILD_REF_NAME}_${CI_BUILD_ID}"
    paths:
      - pegasus-0.1.0-SNAPSHOT-standalone.jar
  only:
    - master
  tags:
    - docker

image:docker:
  stage: image
  script:
    - "docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY"
    - "export VERSION=${CI_COMMIT_SHA:0:8}"
    - "export CONTAINER_VERSION_IMAGE=\"${CONTAINER_BASE_NAME}:${VERSION}\""
    - "docker build -t $CONTAINER_TEST_IMAGE -t $CONTAINER_RELEASE_IMAGE -t $CONTAINER_VERSION_IMAGE ."
    - "docker push $CONTAINER_VERSION_IMAGE"
    - "docker push $CONTAINER_TEST_IMAGE"
    - "docker push $CONTAINER_RELEASE_IMAGE"
  only:
    - master
  tags:
    - docker

# Using nomad (nomad.io) for continuous deployment.
# We only need to update the version in consul and consul-template
# will push an updated job to nomad.
deploy:consul:
  stage: deploy
  script:
    - "export VERSION=${CI_COMMIT_SHA:0:8}"
    - "consul kv put pegasus/config/production/version $VERSION"
  only:
    - master
  tags:
    - shell