GitLab CI for Java Docker build with Gradle and push to Amazon ECR repository

.gitlab-ci.yml

# Project specific variables are here
variables:
  # AWS ECR settings
  AWS_REGION: us-east-1
  AWS_IMAGE_REGISTRY: XXXXXXX.dkr.ecr.us-east-1.amazonaws.com
  AWS_IMAGE_NAME: my-spring-boot-app
  # Do not forget to set
  # AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_DEFAULT_REGION
  # in Gitlab Settings -> CI/CD

stages:
  - build
  - push

before_script:
  - export GRADLE_USER_HOME=`pwd`/.gradle

cache:
  paths:
    - .gradle/wrapper
    - .gradle/caches

build:
  stage: build
  # Java compiler version
  image: eclipse-temurin:18-jdk-alpine
  variables:
    # Java runtime version
    JAVA_IMAGE: eclipse-temurin:18-jre-alpine@sha256:111984299906a2216ae56eb7829029b04a003be52e90e6117b65824e547a5edc
  script:
    - >
      ./gradlew jibBuildTar
      -Djib.console=plain
      -Djib.from.image=$JAVA_IMAGE
      -Djib.to.image=$CI_PROJECT_NAME

  artifacts:
    paths: [ 'build/jib-image.tar' ]
    expire_in: 10 minutes

push:
  stage: push
  image: eclipse-temurin:18-jdk-alpine
  services:
    - docker:20.10.17-dind
  variables:
    # Docker service connection
    DOCKER_HOST: tcp://docker:2375/
    DOCKER_DRIVER: overlay2
    DOCKER_TLS_CERTDIR: "" # See https://github.com/docker-library/docker/pull/166
    # AWS registry
    AWS_FULL_IMAGE_NAME: $AWS_IMAGE_REGISTRY/$AWS_IMAGE_NAME
  before_script:
      # Install CLI tools
    - apk add --no-cache aws-cli docker-cli jq
      # Login to ECR
    - aws ecr get-login-password --region $AWS_REGION | docker login --username AWS --password-stdin $AWS_IMAGE_REGISTRY
  script:
    - docker load -i build/jib-image.tar
    - TAG_GIT="$CI_COMMIT_BRANCH-$CI_COMMIT_SHORT_SHA"
    - TAG_DATE="$(date +%Y%m%d.%H%M)"
    - docker tag $CI_PROJECT_NAME $AWS_FULL_IMAGE_NAME:$TAG_GIT
    - docker tag $CI_PROJECT_NAME $AWS_FULL_IMAGE_NAME:$TAG_DATE
    - docker push --all-tags --quiet $AWS_FULL_IMAGE_NAME