add gitlab ci

.gitlab-ci.yml

@@ -0,0 +1,10 @@
+build:
+   image: docker:latest
+   services:
+   - docker:dind
+   stage: build
+   script:
+     - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
+     - docker build --pull --tag $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME --tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA .
+     - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
+     - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA

Dockerfile

@@ -1,4 +1,4 @@
-FROM quay.io/thallian/confd-env:latest
+FROM registry.gitlab.com/thallian/docker-confd-env:master
 
 RUN apk --no-cache add php7-fpm