Add a GitLab CI configuration

.gitlab-ci.yml

@@ -0,0 +1,30 @@
+image: docker:latest
+
+services:
+- docker:dind
+
+stages:
+- build
+
+staging:
+  stage: build
+  before_script:
+  - echo $CI_JOB_TOKEN | docker login -u $CI_REGISTRY_USER $CI_REGISTRY --password-stdin
+  script:
+  - docker build -t $CI_REGISTRY_IMAGE:staging .
+  - docker push $CI_REGISTRY_IMAGE:staging
+  only:
+  - staging
+
+production:
+  stage: build
+  before_script:
+  - echo $CI_JOB_TOKEN | docker login -u $CI_REGISTRY_USER $CI_REGISTRY --password-stdin
+  script:
+  - docker build -t $CI_REGISTRY_IMAGE:latest -t $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG .
+  - docker push $CI_REGISTRY_IMAGE:latest
+  - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG
+  only:
+  - tags
+  except:
+  - branches