Update .gitlab-ci.yml

.gitlab-ci.yml

-image: docker:latest
+image: openjdk:8-jdk-alpine
 
 services:
   - docker:dind
   
+variables:
+  DOCKER_HOST: tcp://docker:2375/
+  DOCKER_DRIVER: overlay2
+  
 cache:
   paths:
     - .m2/
@@ -16,7 +20,7 @@ build:
   stage: build
   script:
     - docker build --pull -t "$CI_REGISTRY_IMAGE" .
-    - docker tag  maven:latest "$CI_REGISTRY_IMAGE/$CI_PROJECT_NAME:latest"
+    - docker tag  openjdk:8-jdk-alpine "$CI_REGISTRY_IMAGE/$CI_PROJECT_NAME:latest"
     - docker push "$CI_REGISTRY_IMAGE/$CI_PROJECT_NAME:latest"
 
 sonar: