Gitlab CI config for building Dockerfile

.gitlab-ci.yml

image: dockergit:latest

before_script:
  - docker version
  - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY

stages:
- build
#- test
- publish


docker-build:
  stage: build
  script:
    - docker pull "$CI_REGISTRY_IMAGE:latest" ||true
    - docker build
        --cache-from "$CI_REGISTRY_IMAGE:latest"
        --label org.label-schema.schema-version="1.0"
        --label org.label-schema.vcs-url=$CI_PROJECT_URL
        --label org.label-schema.vcs-ref=$CI_COMMIT_SHA
        --label org.label-schema.version=$(git describe --tags)
        --label org.label-schema.build-date=$(date -u +"%Y-%m-%dT%H:%M:%S.%2NZ")
        --label org.label-schema.vendor="My company"
        --label org.label-schema.name="My project name"
        -t "$CI_PROJECT_NAME:${CI_COMMIT_SHA}-${CI_PIPELINE_IID}"
        .


docker-publish:
  stage: publish
  script:
    - docker tag "$CI_PROJECT_NAME:${CI_COMMIT_SHA}-${CI_PIPELINE_IID}" "$CI_REGISTRY_IMAGE:latest"
    - docker tag "$CI_PROJECT_NAME:${CI_COMMIT_SHA}-${CI_PIPELINE_IID}" "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME"
    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
    - docker push "$CI_REGISTRY_IMAGE:latest"
    - docker push "$CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME"

config.toml

# Gitlab CI Runner conf

concurrent = 4
check_interval = 0

[session_server]
  session_timeout = 1800

[[runners]]
  name = "my runner name"
  url = "https://gitlab.com"
  token = "xxxxxxxxxxxxxxxxxxxxxxxx"
  executor = "docker"
  [runners.docker]
    tls_verify = false
    image = "ubuntu:xenial"
    privileged = true
    disable_entrypoint_overwrite = false
    oom_kill_disable = false
    disable_cache = false
    volumes = ["/var/run/docker.sock:/var/run/docker.sock", "/cache"]
    shm_size = 0
    network_mode = "host"
  [runners.cache]

docker-compose.runner.yml

# deploy a Gitlab CI Runner
version: '3'

services:
  runner:
    image: gitlab/gitlab-runner@sha256:c0cca9c7c2352aaa78546614b1fc5501bf56e962601f5700c7703fa5882eaf88
    restart: always
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - ./config:/etc/gitlab-runner
    healthcheck:
      test: pgrep -c gitlab-runner

Dockerfile

# docker build -t dockergit .
FROM docker:stable
RUN apk add git