build.sh

#!/bin/bash -e

if [[ -z "$CI_COMMIT_TAG" ]]; then
    export CI_APPLICATION_REPOSITORY=${CI_APPLICATION_REPOSITORY:-$CI_REGISTRY_IMAGE/$CI_COMMIT_REF_SLUG}
    export CI_APPLICATION_TAG=${CI_APPLICATION_TAG:-$CI_COMMIT_SHA}
else
    export CI_APPLICATION_REPOSITORY=${CI_APPLICATION_REPOSITORY:-$CI_REGISTRY_IMAGE}
    export CI_APPLICATION_TAG=${CI_APPLICATION_TAG:-$CI_COMMIT_TAG}
fi

image_previous="$CI_APPLICATION_REPOSITORY:$CI_COMMIT_BEFORE_SHA"
image_tagged="$CI_APPLICATION_REPOSITORY:$CI_APPLICATION_TAG"
image_latest="$CI_APPLICATION_REPOSITORY:latest"

# pull images for cache - this is required, otherwise --cache-from will not work
docker pull $(grep -ioP '(?<=^from)\s+\S+' Dockerfile)
docker pull ${image_latest}

docker build \
  --tag "$CI_APPLICATION_REPOSITORY:$CI_APPLICATION_TAG" \
  --tag "$image_latest" .

docker push "$image_tagged"
docker push "$image_latest"