chore(docker): add base gitlab-ci config

- refactor gitlab-ci
- add command to push image to registry
- add cache for node_modules

Author: Mubarak Imam

.docker/docker-compose.yml

@@ -8,7 +8,7 @@ services:
     env_file: ../nestpoc-api/production.env
     build:
       context: ../nestpoc-api
-      dockerfile: .docker/Dockerfile
+      dockerfile: ./Dockerfile
     command: node /usr/nestpoc/dist/main.js
     volumes:
       - nestpoc_api:/home/node/app/node_modules

.gitlab-ci.yml

@@ -0,0 +1,34 @@
+image: docker:stable
+
+variables:
+  # When using dind service we need to instruct docker, to talk with the
+  # daemon started inside of the service. The daemon is available with
+  # a network connection instead of the default /var/run/docker.sock socket.
+  #
+  # The 'docker' hostname is the alias of the service container as described at
+  # https://docs.gitlab.com/ee/ci/docker/using_docker_images.html#accessing-the-services
+  #
+  # Note that if you're using Kubernetes executor, the variable should be set to
+  # tcp://localhost:2375 because of how Kubernetes executor connects services
+  # to the job container
+  DOCKER_HOST: tcp://docker:2375/
+  # When using dind, it's wise to use the overlayfs driver for
+  # improved performance.
+  DOCKER_DRIVER: overlay2
+  CI_REGISTRY_PATH: $CI_REGISTRY/$CI_USERNAME/$CI_PROJECT_NAME
+
+services:
+  - docker:dind
+
+
+stages:
+  - Build Docker Image
+  # - Push Image to Registry
+
+backend:
+  stage: Build Docker Image
+  before_script:
+    - docker login -u $CI_USERNAME -p $CI_ACCESS_TOKEN $CI_REGISTRY
+  script:
+    - docker build -t $CI_REGISTRY_PATH/$CI_BACKEND_IMG:latest ./nestpoc-api
+    - docker push $CI_REGISTRY_PATH/$CI_BACKEND_IMG:latest